According to some aspects, a magnetic resonance imaging system capable of imaging a patient is provided. The magnetic resonance imaging system comprising at least one B0 magnet to produce a magnetic field to contribute to a B0 magnetic field for the magnetic resonance imaging system and a member configured to engage with a releasable securing mechanism of a radio frequency coil apparatus, the member attached to the magnetic resonance imaging system at a location so that, when the member is engaged with the releasable securing mechanism of the radio frequency coil apparatus, the radio frequency coil apparatus is secured to the magnetic resonance imaging system substantially within an imaging region of the magnetic resonance imaging system.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
A61B 5/00 - Measuring for diagnostic purposes Identification of persons
A61B 6/04 - Positioning of patientsTiltable beds or the like
A61B 90/14 - Fixators for body parts, e.g. skull clampsConstructional details of fixators, e.g. pins
Systems and methods for training a machine-learning model to generate denoised and dealiased image data are provided. The present disclosure provides techniques for training a machine-learning (ML) model to generate denoised and dealiased imaging data. A method includes (1) training a first ML model using a first training dataset comprising first image data to obtain a second ML model; and (2) training (a) the second ML model or (b) a third ML model using a second training dataset to obtain a fourth ML model. The second training dataset includes (i) the first image data and (ii) training image data obtained by applying at least one of the second ML model or the third ML model to second image data. The denoising and dealiasing ML model may be either the fourth ML model or derived from the fourth ML model.
A61B 5/00 - Measuring for diagnostic purposes Identification of persons
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
An apparatus can include a gauss guard device. The device can be coupled with a portable magnetic resonance imaging device. The device can include multiple arms that can be deployable and/or retractable. The device, in an undeployed state, can be configured such that retracted arms are confined within a footprint of the portable MRI device. The device, in a deployed state, can be configured such that one or more arms extend beyond the footprint of the portable MRI device. The arms of the gauss guard device may be independently deployable, and each may be deployable to different degrees.
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/38 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
Systems and methods for flow suppression in magnetic resonance imaging (MRI) are disclosed. The techniques described herein include determining, for one or more MRI scans, an MRI sequence comprising a flow suppression segment to suppress signal from fluid flow in the one or more MRI scans. The flow suppression segment include an excitation block, a first gradient block including gradients in a plurality of axes, a refocusing block, a second gradient block including gradients in the plurality of axes. The flow suppression segment may include one or more eddy-preparation gradient blocks. The techniques include performing, via an MRI system, the one or more MRI scans using the MRI sequence to obtain one or more MR images.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/50 - NMR imaging systems based on the determination of relaxation times
G01R 33/563 - Image enhancement or correction, e.g. subtraction or averaging techniques of moving material, e.g. flow-contrast angiography
5.
RADIO FREQUENCY COIL FOR MAGNETIC RESONANCE IMAGING
A radio frequency (RF) coil apparatus is described herein for facilitating imaging of a patient positioned within a magnetic resonance imaging (MRI) system, the MRI system comprising a B0 magnet. The apparatus may comprise a frame comprising a first plate and a second plate disposed opposite the first plate; and an RF transmit coil comprising a plurality of conductors connected in series, the plurality of conductors being would around the frame and forming a plurality of turns. According to some aspects, there is provided an MRI system configured to image a patient positioned within the MRI system, the MRI system comprises a B0 magnet that produces a B0 magnetic field and the RF coil apparatus.
A magnetic resonance imaging (MRI) system, comprising: a magnetics system comprising: a B0 magnet configured to provide a B0 field for the MRI system; gradient coils configured to provide gradient fields for the MRI system; and at least one RF coil configured to detect magnetic resonance (MR) signals; and a controller configured to: control the magnetics system to acquire MR spatial frequency data using non-Cartesian sampling; and generate an MR image from the acquired MR spatial frequency data using a neural network model comprising one or more neural network blocks including a first neural network block, wherein the first neural network block is configured to perform data consistency processing using a non-uniform Fourier transformation.
G01R 33/56 - Image enhancement or correction, e.g. subtraction or averaging techniques
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
G06F 17/14 - Fourier, Walsh or analogous domain transformations
G06F 17/18 - Complex mathematical operations for evaluating statistical data
G06V 10/44 - Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersectionsConnectivity analysis, e.g. of connected components
G06V 10/70 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning
G06V 10/764 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using classification, e.g. of video objects
A method of producing a permanent magnet shim configured to improve a profile of a B0 magnetic field produced by a B0 magnet is provided. The method comprises determining deviation of the B0 magnetic field from a desired B0 magnetic field, determining a magnetic pattern that, when applied to magnetic material, produces a corrective magnetic field that corrects for at least some of the determined deviation, and applying the magnetic pattern to the magnetic material to produce the permanent magnet shim. According to some aspects, a permanent magnet shim for improving a profile of a B0 magnetic field produced by a B0 magnet is provided. The permanent magnet shim comprises magnetic material having a predetermined magnetic pattern applied thereto that produces a corrective magnetic field to improve the profile of the B0 magnetic field.
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
G01R 33/24 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
G01R 33/38 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
G01R 33/381 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
G01R 33/3873 - Compensation of inhomogeneities using ferromagnetic bodies
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
In some aspects, a method of operating a magnetic resonance imaging system comprising a B0 magnet and at least one thermal management component configured to transfer heat away from the B0 magnet during operation is provided. The method comprises providing operating power to the B0 magnet, monitoring a temperature of the B0 magnet to determine a current temperature of the B0 magnet, and operating the at least one thermal management component at less than operational capacity in response to an occurrence of at least one event.
Techniques for generating magnetic resonance (MR) images of a subject from MR data obtained by a magnetic resonance imaging (MRI) system, the techniques including: obtaining input MR data obtained by imaging the subject using the MRI system; generating a plurality of transformed input MR data instances by applying a respective first plurality of transformations to the input MR data; generating a plurality of MR images from the plurality of transformed input MR data instances and the input MR data using a non-linear MR image reconstruction technique; generating an ensembled MR image from the plurality of MR images at least in part by: applying a second plurality of transformations to the plurality of MR images to obtain a plurality of transformed MR images; and combining the plurality of transformed MR images to obtain the ensembled MR image; and outputting the ensembled MR image.
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/36 - Electrical details, e.g. matching or coupling of the coil to the receiver
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
G01R 33/56 - Image enhancement or correction, e.g. subtraction or averaging techniques
G06F 18/2134 - Feature extraction, e.g. by transforming the feature spaceSummarisationMappings, e.g. subspace methods based on separation criteria, e.g. independent component analysis
G06V 10/42 - Global feature extraction by analysis of the whole pattern, e.g. using frequency domain transformations or autocorrelation
G06V 10/44 - Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersectionsConnectivity analysis, e.g. of connected components
G06V 10/52 - Scale-space analysis, e.g. wavelet analysis
G06V 10/75 - Organisation of the matching processes, e.g. simultaneous or sequential comparisons of image or video featuresCoarse-fine approaches, e.g. multi-scale approachesImage or video pattern matchingProximity measures in feature spaces using context analysisSelection of dictionaries
G06V 10/82 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using neural networks
G06V 10/88 - Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters
G16H 30/40 - ICT specially adapted for the handling or processing of medical images for processing medical images, e.g. editing
Techniques of prospectively compensating for motion of a subject being imaged by an MRI system, the MRI system comprising a plurality of magnetics components including at least one gradient coil and at least one radio-frequency (RF) coil, the techniques comprising: obtaining first spatial frequency data and second spatial frequency data by operating the MRI system in accordance with a pulse sequence, wherein the pulse sequence is associated with a sampling path that includes at least two non-contiguous portions each for sampling a central region of k-space; determining a transformation using a first image obtained using the first spatial frequency data and a second image obtained using the second spatial frequency data; correcting the pulse sequence using the determined transformation to obtain a corrected pulse sequence; and obtaining additional spatial frequency data in accordance with the corrected pulse sequence.
G01R 33/56 - Image enhancement or correction, e.g. subtraction or averaging techniques
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
Some implementations relate to methods, systems, and computer-readable media for medical imaging. A method includes providing as input to the neural network, a first image and a second image, wherein the first image and the second image are reconstructed from a fast spin echo (FSE) magnetic resonance (MR) imaging sequence, determining, using the neural network, a dense displacement field based at least on the first image and the second image, obtaining, using the neural network, a transformed image based on the first image and the dense displacement field, wherein the transformed image is aligned with the second image, computing a registration loss value based on comparison of the transformed image and the second image, and adjusting one or more parameters of the neural network based on the registration loss value.
Systems and methods for simulating structures and images are disclosed. The techniques described herein can include obtaining a first image of a subject. The techniques can include determining a location for simulating a structure within the first image. The techniques can include simulating, according to the location, a shape for the structure. The techniques can include generating a mask according to the location and the shape for the structure. The techniques can include applying the mask to the first image to generate a second image simulating the structure.
Systems and methods for training and deploying machine learning segmentation models to produce foreground masks of images are provided. The model may be used to generate foreground masks. A first method includes receiving images and annotations indicative of which pixels are in the foregrounds of the images, and generating, based on the images and the annotations, a model configured to receive, as input, a subject image and provide, as output, one or more probability maps indicative of foreground probabilities for pixels in the subject image. A foreground probability is indicative of a likelihood that the pixel is part of a foreground object or artifact in the image. Another method includes receiving a subject image, and generating a foreground mask for the subject image at least in part by applying a machine learning model to the subject image, the model having been generated based on disclosed training methods.
A magnetic resonance (MR) imaging system, comprising a magnetics system having a plurality of magnetics components configured to produce magnetic fields for performing magnetic resonance imaging, and a sensor configured to detect electromagnetic interference conducted by a patient into an imaging region of the MR imaging system. The sensor may comprise at least one electrical conductor configured for electrically coupling to the patient. The MR imaging system may further comprise a noise reduction system configured to receive the electromagnetic interference from the sensor and to suppress electromagnetic interference in detected MR signals received by the MR imaging system based on the electromagnetic interference detected by the sensor.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
A61B 5/00 - Measuring for diagnostic purposes Identification of persons
G01R 33/28 - Details of apparatus provided for in groups
G01R 33/422 - Screening of the radiofrequency field
G01R 33/565 - Correction of image distortions, e.g. due to magnetic field inhomogeneities
G01R 33/58 - Calibration of imaging systems, e.g. using test probes
G01R 29/08 - Measuring electromagnetic field characteristics
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/36 - Electrical details, e.g. matching or coupling of the coil to the receiver
G01R 33/381 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
15.
MULTI-DIRECTION DIFFUSION WEIGHTED IMAGING ON PORTABLE, LOW-FIELD MAGNETIC RESONANCE IMAGING
Systems and methods for low-field multi-directional diffusion-weighted magnetic resonance imaging process are provided. One or more output images are generated based on multi-directional image reconstructions. Motion may be quantified based on signal variation. Certain data may be rejected based on the quantified motion. Image reconstructions may exclude data based on the quantified motion.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
A61B 6/50 - Apparatus or devices for radiation diagnosisApparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body partsApparatus or devices for radiation diagnosisApparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific clinical applications
G01R 33/36 - Electrical details, e.g. matching or coupling of the coil to the receiver
16.
ELECTROMAGNETIC INTERFERENCE SUPPRESSION TECHNIQUES FOR MAGNETIC RESONANCE IMAGING
Systems and methods for suppressing electromagnetic interference (EMI) in magnetic resonance (MR) data are provided. The systems and methods include identifying a first subset of the MR data that is affected by EMI and suppressing EMI in the first subset to obtain a second subset of the MR data. Suppressing EMI in the first subset is performed by: applying a filter to the first subset of the MR data in order to suppress contribution of MR spin echo signals in the first subset of the MR data thereby obtaining signal-suppressed MR data; suppressing EMI in the signal-suppressed MR data to obtain EMI-suppressed MR data; and applying an inverse of the filter to the EMI-suppressed MR data to obtain the second subset of the MR data. The systems and methods include generating an MR image using the second subset of the MR data and outputting the generated MR image.
G01R 33/38 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
G01R 33/3873 - Compensation of inhomogeneities using ferromagnetic bodies
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
18.
DEPLOYABLE GUARD FOR PORTABLE MAGNETIC RESONANCE IMAGING DEVICES
Some aspects of the technology described herein provide for a deployable guard device configured to be coupled to a portable magnetic resonance imaging (MRI) device, the deployable guard device comprising: a plurality of arms that, when the deployable guard device is in a deployed position, at least partially surround a region within which a magnetic field strength of a magnetic field generated by the portable MRI device equals or exceeds a threshold field strength; and at least one deployment device configured to generate a force to facilitate moving the deployable guard device from an undeployed position to the deployed position.
There is provided a radio frequency (RF) coil apparatus for facilitating magnetic resonance imaging (MRI) of at least a part of a patient's body that is positioned within an imaging region of an MRI system. The RF coil apparatus comprises at least one primary RF coil configured to emit RF pulses and generate a first magnetic field during operation of the MRI system and at least one secondary RF coil configured to generate a second magnetic field that, during operation of the MRI system, at least partially counteracts the first magnetic field in an external region outside of the imaging region of the MRI system.
According to some aspects, a device configured to be coupled to a portable magnetic resonance imaging (MRI) device is provided, the device comprising at least one light source arranged to, when operated, project a visible boundary around at least a portion of the portable MRI device, wherein the visible boundary demarcates a region within which a magnetic field strength of a magnetic field generated by the portable MRI device equals or exceeds a threshold. The at least one light source may be arranged such that an angle of the at least one light source relative to the portable MRI device is adjustable and wherein adjusting the angle of the at least one light source relative to the portable MRI device changes a shape and/or size of the visible boundary.
A computer-implemented method that includes providing as input to the neural network, a first image and a second image. The method further includes obtaining, using the neural network, a first transformed image based on the first image that may be aligned with the second image. The method further includes computing a first loss value based on a comparison of the first transformed image and the second image. The method further includes obtaining, using the neural network, a second transformed image based on the second image that may be aligned with the first image. The method further includes computing a second loss value based on a comparison of the second transformed image and the first image. The method further includes adjusting one or more parameters of the neural network based on the first loss value and the second loss value.
The present disclosure provides techniques for using opto-isolator circuitry to control switching circuitry configured to be coupled to a radio-frequency (RF) coil of a magnetic resonance imaging (MRI) system. In some embodiments, opto-isolator circuitry described herein may be configured to galvanically isolate switch controllers of the MRI system from the switching circuitry and/or provide feedback across an isolation barrier. Some embodiments provide an apparatus including switching circuitry configured to be coupled to an RF coil of an MRI system and a drive circuit that includes opto-isolator circuitry configured to control the switching circuitry. Some embodiments provide an MRI system that includes an RF coil configured to, when operated, transmit and/or receive RF signals to and/or from a field of view of the MRI system, switching circuitry coupled to the RF coil, and a drive circuit that includes opto-isolator circuitry configured to control the switching circuitry.
A computer-implemented method that includes providing as input to the neural network, a first image and a second image. The method further includes obtaining, using the neural network, a transformed image based on the first image that may be aligned with the second image. The method further includes obtaining a plurality of first patches from the transformed image by encoding the transformed image using a first encoder that has a first plurality of encoding layers. The method further includes obtaining a plurality of second patches from the second image by encoding the second image using a second encoder that has a second plurality of encoding layers. The method further includes computing a loss value based on comparison of respective first patches and second patches. The method further includes adjusting one or more parameters of the neural network based on the loss value.
A magnetic resonance imaging (MRI) system and method for acquiring magnetic resonance (MR) images using a pulse sequence implementing driven equilibrium and quadratic phase cycling techniques is provided. The method includes, during a pulse repetition period of a pulse sequence and using a quadratic phase cycling scheme, applying a first RF pulse to deflect a net magnetization vector associated with the subject from a longitudinal plane into a transverse plane; after applying the first RF pulse, applying a first sequence of RF pulses each of which flips the net magnetization vector by approximately 180 degrees within the transverse plane; and after applying the first sequence of RF pulses, applying a second RF pulse to deflect the net magnetization vector from the transverse plane to the longitudinal plane.
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
G01R 33/36 - Electrical details, e.g. matching or coupling of the coil to the receiver
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
An apparatus for controlling at least one gradient coil of a magnetic resonance imaging (MRI) system. The apparatus may include at least one computer hardware processor; and at least one computer-readable storage medium storing processor executable instructions that, when executed by the at least one computer hardware processor, cause the at least one computer hardware processor to perform a method. The method may include receiving information specifying at least one target pulse sequence; determining a corrected pulse sequence to control the at least one gradient coil based on the at least one target pulse sequence and a hysteresis model of induced magnetization in the MRI system caused by operation of the at least one gradient coil; and controlling, using the corrected gradient pulse sequence, the at least one gradient coil to generate one or more gradient pulses for imaging a patient.
Techniques are provided for imaging a subject. The method may comprise receiving an indication to image the subject using an magnetic resonance imaging (MRI) system, and in response to receiving the indication, with at least one controller: generating, using at least one RF coil, an initial MR data set for generating an initial image of the subject; determining, using the initial MR image, a difference in orientation between a current orientation of the subject in the initial MR image and a target orientation of the subject; determining, using the determined difference in orientation, an adjustment to a gradient pulse sequence for controlling at least one gradient coil; applying the determined adjustment to the gradient pulse sequence to obtain an adjusted gradient pulse sequence; generating an adjusted MR data set using the adjusted gradient pulse sequence; and generating a second MR image of the subject using the adjusted MR data set.
G01R 33/54 - Signal processing systems, e.g. using pulse sequences
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
27.
Systems and methods for providing operating power to an magnetic resonance imaging (MRI) system
Systems and methods for operating a magnetic resonance imaging (MRI) system are provided. The MRI system includes a magnetics system and a power system configured to provide power to at least some of the magnetics system. The power system includes an energy storage device and a power supply configured to receive mains electricity. The MRI system also includes at least one controller configured to control the MRI system to operate in accordance with a pulse sequence at least in part by generating, by using power supplied by the power supply and supplemental power supplied by the energy storage device, at least one gradient field using at least one gradient coil of the magnetics system.
Techniques for generating magnetic resonance (MR) images of a subject from MR data obtained by a magnetic resonance imaging (MRI) system, the techniques including: obtaining input MR data obtained by imaging the subject using the MRI system; generating a plurality of transformed input MR data instances by applying a respective first plurality of transformations to the input MR data; generating a plurality of MR images from the plurality of transformed input MR data instances and the input MR data using a non-linear MR image reconstruction technique; generating an ensembled MR image from the plurality of MR images at least in part by: applying a second plurality of transformations to the plurality of MR images to obtain a plurality of transformed MR images; and combining the plurality of transformed MR images to obtain the ensembled MR image; and outputting the ensembled MR image.
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/36 - Electrical details, e.g. matching or coupling of the coil to the receiver
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
G01R 33/56 - Image enhancement or correction, e.g. subtraction or averaging techniques
G06F 18/2134 - Feature extraction, e.g. by transforming the feature spaceSummarisationMappings, e.g. subspace methods based on separation criteria, e.g. independent component analysis
G06V 10/42 - Global feature extraction by analysis of the whole pattern, e.g. using frequency domain transformations or autocorrelation
G06V 10/44 - Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersectionsConnectivity analysis, e.g. of connected components
G06V 10/52 - Scale-space analysis, e.g. wavelet analysis
G06V 10/75 - Organisation of the matching processes, e.g. simultaneous or sequential comparisons of image or video featuresCoarse-fine approaches, e.g. multi-scale approachesImage or video pattern matchingProximity measures in feature spaces using context analysisSelection of dictionaries
G06V 10/82 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using neural networks
G06V 10/88 - Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters
G16H 30/40 - ICT specially adapted for the handling or processing of medical images for processing medical images, e.g. editing
Systems and methods for simulating structures and images are disclosed. The techniques described herein can include obtaining a first image of a subject. The techniques can include determining a location for simulating a structure within the first image. The techniques can include simulating, according to the location, a shape for the structure. The techniques can include generating a mask according to the location and the shape for the structure. The techniques can include applying the mask to the first image to generate a second image simulating the structure.
Systems and methods for training and deploying machine learning segmentation models to produce foreground masks of images are provided. The model may be used to generate foreground masks. A first method includes receiving images and annotations indicative of which pixels are in the foregrounds of the images, and generating, based on the images and the annotations, a model configured to receive, as input, a subject image and provide, as output, one or more probability maps indicative of foreground probabilities for pixels in the subject image. A foreground probability is indicative of a likelihood that the pixel is part of a foreground object or artifact in the image. Another method includes receiving a subject image, and generating a foreground mask for the subject image at least in part by applying a machine learning model to the subject image, the model having been generated based on disclosed training methods.
Techniques for removing artefacts, such as RF interference and/or noise, from magnetic resonance data. The techniques include: obtaining input magnetic resonance (MR) data using at least one radio-frequency (RF) coil of a magnetic resonance imaging (MRI) system; and generating an MR image from input MR data at least in part by using a neural network model to suppress at least one artefact in the input MR data.
G06V 10/764 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using classification, e.g. of video objects
G06V 10/772 - Determining representative reference patterns, e.g. averaging or distorting patternsGenerating dictionaries
G06V 10/774 - Generating sets of training patternsBootstrap methods, e.g. bagging or boosting
G06V 10/82 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using neural networks
G06V 10/44 - Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersectionsConnectivity analysis, e.g. of connected components
Systems and methods for suppressing electromagnetic interference (EMI) in magnetic resonance (MR) data are provided. The systems and methods include identifying a first subset of the MR data that is affected by EMI and suppressing EMI in the first subset to obtain a second subset of the MR data. Suppressing EMI in the first subset is performed by: applying a filter to the first subset of the MR data in order to suppress contribution of MR spin echo signals in the first subset of the MR data thereby obtaining signal-suppressed MR data; suppressing EMI in the signal-suppressed MR data to obtain EMI-suppressed MR data; and applying an inverse of the filter to the EMI-suppressed MR data to obtain the second subset of the MR data. The systems and methods include generating an MR image using the second subset of the MR data and outputting the generated MR image.
Methods and apparatus for reducing noise in RF signal chain circuitry for a low-field magnetic resonance imaging system are provided. A switching circuit in the RF signal chain circuitry may include at least one field effect transistor (FET) configured to operate as an RF switch at an operating frequency of less than 10 MHz. A decoupling circuit may include tuning circuitry coupled across inputs of an amplifier and active feedback circuitry coupled between an output of the amplifier and an input of the amplifier, wherein the active feedback circuitry includes a feedback capacitor configured to reduce a quality factor of an RF coil coupled to the amplifier.
Systems and methods are provided herein for determining whether to extend scanning performed by a magnetic resonance imaging (MRI) system. According to some embodiments, there is provided a method for imaging a subject using an MRI system, comprising: obtaining data for generating at least one magnetic resonance image of the subject by operating the MRI system in accordance with a first pulse sequence; prior to completing the obtaining the data in accordance with the first pulse sequence, determining to collect additional data to augment and/or replace at least some of the obtained data; determining a second pulse sequence to use for obtaining the additional data; and after completing the obtaining the data in accordance with the first pulse sequence, obtaining the additional data by operating the MRI system in accordance with the second pulse sequence.
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
G01R 33/24 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
G01R 33/38 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
G01R 33/381 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
G01R 33/3873 - Compensation of inhomogeneities using ferromagnetic bodies
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
0 magnet. The radio frequency apparatus may be configured to detect magnetic resonance signals emitted from anatomy of a patient when positioned within a low-field magnetic resonance imaging system, the radio frequency apparatus comprising a flexible substrate capable of being positioned about the anatomy of the patient and a plurality of radio frequency coils coupled to the flexible substrate, each of the plurality of radio frequency coils forming a plurality of turns.
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/3415 - Constructional details, e.g. resonators comprising surface coils comprising arrays of sub-coils
37.
B0 magnet methods and apparatus for a magnetic resonance imaging system
According to some aspects, a system configured to facilitate imaging an infant using a magnetic resonance imaging (MRI) device is provided herein. The system comprises an infant-carrying apparatus comprising an infant support configured to support the infant and an isolette for positioning the infant relative to the MRI device, the isolette comprising: a base for supporting the infant-carrying apparatus; and a bottom surface configured to be coupled to the MRI device. In some embodiments, the infant-carrying apparatus further comprises at least one radio frequency (RF) coil coupled to the infant support and configured to be coupled to the MRI device to detect MR signals during imaging performed by the MRI device. A method for positioning an infant relative to an MRI device using an infant-carrying apparatus and isolette is further provided herein.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
A61B 5/242 - Detecting biomagnetic fields, e.g. magnetic fields produced by bioelectric currents
G01R 33/28 - Details of apparatus provided for in groups
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
G01R 33/54 - Signal processing systems, e.g. using pulse sequences
40.
Techniques for dynamic control of a magnetic resonance imaging system
Techniques are described for controlling components of a Magnetic Resonance Imaging (MRI) system with a single controller, such as a Field Programmable Gate Array (FPGA), by dynamically instructing the controller to issue commands to the components using a processor coupled to the controller. According to some aspects, the controller may issue commands to the components of the MRI system whilst actively receiving commands from the processor to be later issued to the components.
G01R 33/54 - Signal processing systems, e.g. using pulse sequences
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
Techniques of prospectively compensating for motion of a subject being imaged by an MRI system, the MRI system comprising a plurality of magnetics components including at least one gradient coil and at least one radio-frequency (RF) coil, the techniques comprising: obtaining first spatial frequency data and second spatial frequency data by operating the MRI system in accordance with a pulse sequence, wherein the pulse sequence is associated with a sampling path that includes at least two non-contiguous portions each for sampling a central region of k-space; determining a transformation using a first image obtained using the first spatial frequency data and a second image obtained using the second spatial frequency data; correcting the pulse sequence using the determined transformation to obtain a corrected pulse sequence; and obtaining additional spatial frequency data in accordance with the corrected pulse sequence.
G01R 33/56 - Image enhancement or correction, e.g. subtraction or averaging techniques
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
According to some aspects, a method of suppressing noise in an environment of a magnetic resonance imaging system is provided. The method comprising estimating a transfer function based on multiple calibration measurements obtained from the environment by at least one primary coil and at least one auxiliary sensor, respectively, estimating noise present in a magnetic resonance signal received by the at least one primary coil based at least in part on the transfer function, and suppressing noise in the magnetic resonance signal using the noise estimate.
Techniques for compensating for presence of eddy currents during the operation of a magnetic resonance imaging (MRI) system in accordance with a pulse sequence, the pulse sequence comprising a gradient waveform associated with a target gradient field. The techniques include: compensating for presence of eddy currents during operation of the MRI system at least in part by correcting the gradient waveform using a nonlinear function of a characteristic of the gradient waveform to obtain a corrected gradient waveform; and operating the MRI system in accordance with the corrected gradient waveform to generate the target gradient field.
Some aspects comprise a tuning system configured to tune a radio frequency coil for use with a magnetic resonance imaging system comprising a tuning circuit including at least one tuning element configured to affect a frequency at which the radio frequency coil resonates, and a controller configured to set at least one value for the tuning element to cause the radio frequency coil to resonate at approximately a Larmor frequency of the magnetic resonance imaging system determined by the tuning system. Some aspects include a method of automatically tuning a radio frequency coil comprising determining information indicative of a Larmor frequency of the magnetic resonance imaging system, using a controller to automatically set at least one value of a tuning circuit to cause the radio frequency coil to resonate at approximately the Larmor frequency based on the determined information.
Aspects relate to providing radio frequency components responsive to magnetic resonance signals. According to some aspects, a radio frequency component comprises at least one coil having a conductor arranged in a plurality of turns oriented about a region of interest to respond to corresponding magnetic resonant signal components. According to some aspects, the radio frequency component comprises a plurality of coils oriented to respond to corresponding magnetic resonant signal components. According to some aspects, an optimization is used to determine a configuration for at least one radio frequency coil.
A61B 5/00 - Measuring for diagnostic purposes Identification of persons
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/36 - Electrical details, e.g. matching or coupling of the coil to the receiver
G01R 33/381 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
46.
ELECTROMAGNETIC SHIELDING FOR MAGNETIC RESONANCE IMAGING METHODS AND APPARATUS
According to some aspects, a portable magnetic resonance imaging system is provided, comprising a Bo magnet configured to produce a Bo magnetic field for an imaging region of the magnetic resonance imaging system, a noise reduction system configured to detect and suppress at least some electromagnetic noise in an operating environment of the portable magnetic resonance imaging system, and electromagnetic shielding provided to attenuate at least some of the electromagnetic noise in the operating environment of the portable magnetic resonance imaging system, the electromagnetic shielding arranged to shield a fraction of the imaging region of the portable magnetic resonance imaging system. According to some aspects, the electromagnetic shield comprises at least one electromagnetic shield structure adjustably coupled to the housing to provide electromagnetic shielding for the imaging region in an amount that can be varied. According to some aspects, substantially no shielding of the imaging region is provided.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
A61B 90/00 - Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups , e.g. for luxation treatment or for protecting wound edges
47.
PERMANENT MAGNET ASSEMBLY FOR MAGNETIC RESONANCE IMAGING WITH NON-FERROMAGNETIC FRAME
An assembly for providing a B0 magnetic field for a magnetic resonance imaging (MRI) system, the assembly comprising: a plurality of rods extending along a common longitudinal direction and positioned to form a bore extending along the common longitudinal direction, the plurality of rods including a first rod, the first rod comprising: ferromagnetic segments, each having a net magnetization in a plane that is substantially perpendicular to the common longitudinal direction; and non-ferromagnetic segments.
According to some aspects, a magnetic resonance imaging system capable of imaging a patient is provided. The magnetic resonance imaging system comprising at least one B0 magnet to produce a magnetic field to contribute to a B0 magnetic field for the magnetic resonance imaging system and a member configured to engage with a releasable securing mechanism of a radio frequency coil apparatus, the member attached to the magnetic resonance imaging system at a location so that, when the member is engaged with the releasable securing mechanism of the radio frequency coil apparatus, the radio frequency coil apparatus is secured to the magnetic resonance imaging system substantially within an imaging region of the magnetic resonance imaging system.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
A61B 90/14 - Fixators for body parts, e.g. skull clampsConstructional details of fixators, e.g. pins
Some aspects of the technology described herein provide for a deployable guard device configured to be coupled to a portable magnetic resonance imaging (MRI) device, the deployable guard device comprising: a plurality of arms that, when the deployable guard device is in a deployed position, at least partially surround a region within which a magnetic field strength of a magnetic field generated by the portable MRI device equals or exceeds a threshold field strength; and at least one deployment device configured to generate a force to facilitate moving the deployable guard device from an undeployed position to the deployed position.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/34 - Constructional details, e.g. resonators
50.
Systems and methods for low-field fast spin echo imaging
A magnetic resonance imaging (MRI) system and method for acquiring magnetic resonance (MR) images using a pulse sequence implementing driven equilibrium and quadratic phase cycling techniques is provided. The method includes, during a pulse repetition period of a pulse sequence and using a quadratic phase cycling scheme, applying a first RF pulse to deflect a net magnetization vector associated with the subject from a longitudinal plane into a transverse plane; after applying the first RF pulse, applying a first sequence of RF pulses each of which flips the net magnetization vector by approximately 180 degrees within the transverse plane; and after applying the first sequence of RF pulses, applying a second RF pulse to deflect the net magnetization vector from the transverse plane to the longitudinal plane.
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
G01R 33/54 - Signal processing systems, e.g. using pulse sequences
G01R 33/36 - Electrical details, e.g. matching or coupling of the coil to the receiver
G01R 33/38 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
G01R 33/3873 - Compensation of inhomogeneities using ferromagnetic bodies
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
52.
DIFFEOMORPHIC MR IMAGE REGISTRATION AND RECONSTRUCTION
Some implementations relate to methods, systems, and computer-readable media for medical imaging. A method includes providing as input to the neural network, a first image and a second image, wherein the first image and the second image are reconstructed from a fast spin echo (FSE) magnetic resonance (MR) imaging sequence, determining, using the neural network, a dense displacement field based at least on the first image and the second image, obtaining, using the neural network, a transformed image based on the first image and the dense displacement field, wherein the transformed image is aligned with the second image, computing a registration loss value based on comparison of the transformed image and the second image, and adjusting one or more parameters of the neural network based on the registration loss value.
A computer-implemented method that includes providing as input to the neural network, a first image and a second image. The method further includes obtaining, using the neural network, a first transformed image based on the first image that may be aligned with the second image. The method further includes computing a first loss value based on a comparison of the first transformed image and the second image. The method further includes obtaining, using the neural network, a second transformed image based on the second image that may be aligned with the first image. The method further includes computing a second loss value based on a comparison of the second transformed image and the first image. The method further includes adjusting one or more parameters of the neural network based on the first loss value and the second loss value.
There is provided a radio frequency (RF) coil apparatus for facilitating magnetic resonance imaging (MRI) of at least a part of a patient's body that is positioned within an imaging region of an MRI system. The RF coil apparatus comprises at least one primary RF coil configured to emit RF pulses and generate a first magnetic field during operation of the MRI system and at least one secondary RF coil configured to generate a second magnetic field that, during operation of the MRI system, at least partially counteracts the first magnetic field in an external region outside of the imaging region of the MRI system.
A computer-implemented method that includes providing as input to the neural network, a first image and a second image. The method further includes obtaining, using the neural network, a transformed image based on the first image that may be aligned with the second image. The method further includes obtaining a plurality of first patches from the transformed image by encoding the transformed image using a first encoder that has a first plurality of encoding layers. The method further includes obtaining a plurality of second patches from the second image by encoding the second image using a second encoder that has a second plurality of encoding layers. The method further includes computing a loss value based on comparison of respective first patches and second patches. The method further includes adjusting one or more parameters of the neural network based on the loss value.
According to some aspects, a device configured to be coupled to a portable magnetic resonance imaging (MRI) device is provided, the device comprising at least one light source arranged to, when operated, project a visible boundary around at least a portion of the portable MRI device, wherein the visible boundary demarcates a region within which a magnetic field strength of a magnetic field generated by the portable MRI device equals or exceeds a threshold. The at least one light source may be arranged such that an angle of the at least one light source relative to the portable MRI device is adjustable and wherein adjusting the angle of the at least one light source relative to the portable MRI device changes a shape and/or size of the visible boundary.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
A61B 90/00 - Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups , e.g. for luxation treatment or for protecting wound edges
G01R 33/20 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance
57.
FERROMAGNETIC AUGMENTATION FOR MAGNETIC RESONANCE IMAGING
In some aspects, a magnetic system for use in a low-field MRI system. The magnetic system comprises at least one electromagnet configured to, when operated, generate a magnetic field to contribute to a B0 field for the low-field MRI system, and at least one permanent magnet to produce a magnetic field to contribute to the B0 field.
Techniques are provided for imaging a subject. The method may comprise receiving an indication to image the subject using an magnetic resonance imaging (MRI) system, and in response to receiving the indication, with at least one controller: generating, using at least one RF coil, an initial MR data set for generating an initial image of the subject; determining, using the initial MR image, a difference in orientation between a current orientation of the subject in the initial MR image and a target orientation of the subject; determining, using the determined difference in orientation, an adjustment to a gradient pulse sequence for controlling at least one gradient coil; applying the determined adjustment to the gradient pulse sequence to obtain an adjusted gradient pulse sequence; generating an adjusted MR data set using the adjusted gradient pulse sequence; and generating a second MR image of the subject using the adjusted MR data set.
Techniques are provided for imaging a subject. A magnetic resonance imaging (MRI) system may use at least one RF coil to generate an initial MR data set for an initial image of the subject. The MRI system may use the initial MR image to determine a difference in orientation between a current orientation of the subject in the initial MR image and a target orientation of the subject. The MRI system may use the determined difference in orientation to determine an adjustment to a gradient pulse sequence for controlling at least one gradient coil. The MRI system may apply the determined adjustment to the gradient pulse sequence to obtain an adjusted gradient pulse sequence. The MRI system may generate an adjusted MR data set using the adjusted gradient pulse sequence, and a second MR image of the subject using the adjusted MR data set.
G01V 3/00 - Electric or magnetic prospecting or detectingMeasuring magnetic field characteristics of the earth, e.g. declination or deviation
G01R 33/54 - Signal processing systems, e.g. using pulse sequences
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
60.
Systems and methods for dynamically extending magnetic resonance imaging of a subject
Systems and methods are provided herein for determining whether to extend scanning performed by a magnetic resonance imaging (MRI) system. According to some embodiments, there is provided a method for imaging a subject using an MRI system, comprising: obtaining data for generating at least one magnetic resonance image of the subject by operating the MRI system in accordance with a first pulse sequence; prior to completing the obtaining the data in accordance with the first pulse sequence, determining to collect additional data to augment and/or replace at least some of the obtained data; determining a second pulse sequence to use for obtaining the additional data; and after completing the obtaining the data in accordance with the first pulse sequence, obtaining the additional data by operating the MRI system in accordance with the second pulse sequence.
0 field for the MRI system; gradient coils configured to provide gradient fields for the MRI system; and at least one RF coil configured to detect magnetic resonance (MR) signals; and a controller configured to: control the magnetics system to acquire MR spatial frequency data using non-Cartesian sampling; and generate an MR image from the acquired MR spatial frequency data using a neural network model comprising one or more neural network blocks including a first neural network block, wherein the first neural network block is configured to perform data consistency processing using a non-uniform Fourier transformation.
G01R 33/56 - Image enhancement or correction, e.g. subtraction or averaging techniques
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
G06F 17/14 - Fourier, Walsh or analogous domain transformations
G06F 17/18 - Complex mathematical operations for evaluating statistical data
G06V 10/44 - Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersectionsConnectivity analysis, e.g. of connected components
G06V 10/70 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning
G06V 10/764 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using classification, e.g. of video objects
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
G01R 33/24 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
G01R 33/38 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
G01R 33/381 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
G01R 33/3873 - Compensation of inhomogeneities using ferromagnetic bodies
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
The present disclosure provides techniques for using opto-isolator circuitry to control switching circuitry configured to be coupled to a radio-frequency (RF) coil of a magnetic resonance imaging (MRI) system. In some embodiments, opto-isolator circuitry described herein may be configured to galvanically isolate switch controllers of the MRI system from the switching circuitry and/or provide feedback across an isolation barrier. Some embodiments provide an apparatus including switching circuitry configured to be coupled to an RF coil of an MRI system and a drive circuit that includes opto-isolator circuitry configured to control the switching circuitry. Some embodiments provide an MRI system that includes an RF coil configured to, when operated, transmit and/or receive RF signals to and/or from a field of view of the MRI system, switching circuitry coupled to the RF coil, and a drive circuit that includes opto-isolator circuitry configured to control the switching circuitry.
Techniques for denoising a magnetic resonance (MR) image are provided, including: obtaining a noisy MR image; denoising the noisy MR image of the subject using a denoising neural network model, and outputting a denoised MR image. The denoising neural network model is trained by: generating first training data for training a first neural network model to denoise MR images by generating a first plurality of noisy MR images using clean MR data associated with a source domain and first MR noise data associated with the target domain; training the first neural network model using the first training data; generating training data for training the denoising neural network model by applying the first neural network model to a second plurality of noisy MR images and generating a plurality of denoised MR images; and training the denoising neural network model using the training data for training the denoising neural network model.
According to some aspects, an apparatus is provided comprising a deployable guard device, configured to be coupled to a portable medical imaging device, the deployable guard device further configured to, when deployed, inhibit encroachment within a physical boundary with respect to the portable medical imaging device. According to some aspects, an apparatus is provided comprising a deployable guard device, configured to be coupled to a portable magnetic resonance imaging system, the deployable guard device further configured to, when deployed, demarcate a boundary within which a magnetic field strength of a magnetic field generated by the portable magnetic resonance imaging system equals or exceeds a given threshold.
Techniques for denoising a magnetic resonance (MR) image are provided, including: obtaining a noisy MR image; denoising the noisy MR image of the subject using a denoising neural network model, and outputting a denoised MR image. The denoising neural network model is trained by: generating first training data for training a first neural network model to denoise MR images by generating a first plurality of noisy MR images using clean MR data associated with a source domain and first MR noise data associated with the target domain; training the first neural network model using the first training data; generating training data for training the denoising neural network model by applying the first neural network model to a second plurality of noisy MR images and generating a plurality of denoised MR images; and training the denoising neural network model using the training data for training the denoising neural network model.
According to some aspects, a magnetic resonance imaging system capable of imaging a patient is provided. The magnetic resonance imaging system comprising at least one BO magnet to produce a magnetic field to contribute to a BO magnetic field for the magnetic resonance imaging system and a member configured to engage with a releasable securing mechanism of a radio frequency coil apparatus, the member attached to the magnetic resonance imaging system at a location so that, when the member is engaged with the releasable securing mechanism of the radio frequency coil apparatus, the radio frequency coil apparatus is secured to the magnetic resonance imaging system substantially within an imaging region of the magnetic resonance imaging system.
G01R 33/34 - Constructional details, e.g. resonators
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
According to some aspects, a method of suppressing noise in an environment of a magnetic resonance imaging system is provided. The method comprising estimating a transfer function based on multiple calibration measurements obtained from the environment by at least one primary coil and at least one auxiliary sensor, respectively, estimating noise present in a magnetic resonance signal received by the at least one primary coil based at least in part on the transfer function, and suppressing noise in the magnetic resonance signal using the noise estimate.
Systems and methods for operating a magnetic resonance imaging (MRI) system are provided. The MRI system includes a magnetics system and a power system configured to provide power to at least some of the magnetics system. The power system includes an energy storage device and a power supply configured to receive mains electricity. The MRI system also includes at least one controller configured to control the MRI system to operate in accordance with a pulse sequence at least in part by generating, by using power supplied by the power supply and supplemental power supplied by the energy storage device, at least one gradient field using at least one gradient coil of the magnetics system.
Techniques for generating magnetic resonance (MR) images of a subject from MR data obtained by a magnetic resonance imaging (MRI) system, the techniques including: obtaining input MR data obtained by imaging the subject using the MRI system; generating a plurality of transformed input MR data instances by applying a respective first plurality of transformations to the input MR data; generating a plurality of MR images from the plurality of transformed input MR data instances and the input MR data using a non-linear MR image reconstruction technique; generating an ensembled MR image from the plurality of MR images at least in part by: applying a second plurality of transformations to the plurality of MR images to obtain a plurality of transformed MR images; and combining the plurality of transformed MR images to obtain the ensembled MR image; and outputting the ensembled MR image.
G01R 33/56 - Image enhancement or correction, e.g. subtraction or averaging techniques
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G06N 3/082 - Learning methods modifying the architecture, e.g. adding, deleting or silencing nodes or connections
G06V 10/75 - Organisation of the matching processes, e.g. simultaneous or sequential comparisons of image or video featuresCoarse-fine approaches, e.g. multi-scale approachesImage or video pattern matchingProximity measures in feature spaces using context analysisSelection of dictionaries
G06F 18/2134 - Feature extraction, e.g. by transforming the feature spaceSummarisationMappings, e.g. subspace methods based on separation criteria, e.g. independent component analysis
G06V 10/42 - Global feature extraction by analysis of the whole pattern, e.g. using frequency domain transformations or autocorrelation
G06V 10/82 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using neural networks
G06V 10/44 - Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersectionsConnectivity analysis, e.g. of connected components
A magnetic resonance imaging (MRI) system and method for acquiring magnetic resonance (MR) images using a pulse sequence implementing driven equilibrium and quadratic phase cycling techniques is provided. The method includes, during a pulse repetition period of a pulse sequence and using a quadratic phase cycling scheme, applying a first RF pulse to deflect a net magnetization vector associated with the subject from a longitudinal plane into a transverse plane; after applying the first RF pulse, applying a first sequence of RF pulses each of which flips the net magnetization vector by approximately 180 degrees within the transverse plane; and after applying the first sequence of RF pulses, applying a second RF pulse to deflect the net magnetization vector from the transverse plane to the longitudinal plane.
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
G01R 33/54 - Signal processing systems, e.g. using pulse sequences
G01R 33/36 - Electrical details, e.g. matching or coupling of the coil to the receiver
Systems and methods for generating a gradient waveform for use by a low-field MRI system to generate a gradient magnetic field are provided herein. The gradient waveform can be determined using first information indicative of the gradient waveform and second information indicative of hardware constraints of the low-field MRI system including a maximum voltage of the gradient power amplifier, a maximum slew rate of the gradient coil, a resistance of the gradient coil, and an inductance of the gradient coil. In some embodiments, the gradient waveform can be a trapezoidal gradient waveform determined to have a non-linear ramp-up portion and/or a non-linear ramp-down portion.
Some aspects comprise a tuning system configured to tune a radio frequency coil for use with a magnetic resonance imaging system comprising a tuning circuit including at least one tuning element configured to affect a frequency at which the radio frequency coil resonates, and a controller configured to set at least one value for the tuning element to cause the radio frequency coil to resonate at approximately a Larmor frequency of the magnetic resonance imaging system determined by the tuning system. Some aspects include a method of automatically tuning a radio frequency coil comprising determining information indicative of a Larmor frequency of the magnetic resonance imaging system, using a controller to automatically set at least one value of a tuning circuit to cause the radio frequency coil to resonate at approximately the Larmor frequency based on the determined information.
0 magnetic field for a magnetic resonance imaging (MRI) system, the assembly comprising: a plurality of rods extending along a common longitudinal direction and positioned to form a bore extending along the common longitudinal direction, the plurality of rods including a first rod, the first rod comprising: ferromagnetic segments, each having a net magnetization in a plane that is substantially perpendicular to the common longitudinal direction; and non-ferromagnetic segments.
Systems and methods for automated assembly of a B0 magnet assembly for use in a point-of-care MRI system are provided herein. A gripper capable of gripping a permanent magnet with a high clamping force is provided for positioning the permanent magnet in the B0 magnet assembly in accordance with a permanent magnet layout. A robot having multiple degrees of freedom is provided for positioning the gripper. Components of the system described herein have been developed to withstand the effects of strong magnetic forces generated by high-strength magnetic fields surrounding the B0 magnet assembly.
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
G01R 33/3873 - Compensation of inhomogeneities using ferromagnetic bodies
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
79.
Ferromagnetic frame for magnetic resonance imaging
0 magnet and a first post attached to the first plate using a first connection assembly, wherein the first connection assembly includes a first connector that connects the first post and the first plate and a second connector attached to the first connector.
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
G01R 33/3873 - Compensation of inhomogeneities using ferromagnetic bodies
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
80.
Low noise gradient amplification components for MR systems
Described herein are power components that may facilitate efficient, low noise operation of low-field MRI systems. In some embodiments, the power components may include switching power converters configured to switch in a manner that reduces or eliminates noise within a desired frequency band (e.g., the Larmor frequency band) due to harmonics of the switching frequency. For example, the desired frequency band may be positioned between adjacent integer harmonics of the switching frequency. In some embodiments, harmonic components generated by multiple switching power converters may destructively interfere with one another, reducing or eliminating the amplitude of the harmonic components of the switching frequency that reside in the desired frequency band. In some embodiments, the power components may include switching power converters configured in parallel without the need for active current balancing circuitry.
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
H02M 5/293 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
81.
Permanent magnet assembly for magnetic resonance imaging with non-ferromagnetic frame
0 magnetic field for a magnetic resonance imaging (MRI) system, the assembly comprising: a plurality of ferromagnetic segments positioned to form: a bore extending along a common longitudinal direction, and a first gap, on a first side of the bore, to accommodate at least one first gradient coil, wherein at least some of the plurality of ferromagnetic segments are positioned on one side of the first gap and at least some others of the plurality of ferromagnetic segments are positioned on another side of the first gap.
Techniques for suppressing noise in an environment of a magnetic resonance (MR) imaging system having at least one primary coil and at least one auxiliary sensor. The techniques involve estimating a transform, that, when applied to noise received by the at least one auxiliary sensor, provides an estimate of noise received by the at least one primary coil. The transform is estimated from data obtained by the at least one primary coil and the least one auxiliary sensor, with the data being weighted prior to estimation to remove or suppress data in regions with a high signal to noise ratio. In turn, the estimated transform may be applied to noise measured by the at least one auxiliary sensor during imaging of a patient, to estimate and suppress noise present in the MR signals received by the at least one primary coil during imaging.
G01R 33/58 - Calibration of imaging systems, e.g. using test probes
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
A device and method for detecting motion and position of a patient positioned within a magnetic resonance imaging system, the device including at least one sensor configured to be capacitively coupled to the patient during magnetic resonance imaging. The method includes, while a patient is positioned within a magnetic resonance imaging system, measuring a reflected power value indicative of an amount of power reflected by the at least one sensor in response to being driven by at least one RF signal, and determining, using the reflected power value, whether the patient has moved.
G01R 33/565 - Correction of image distortions, e.g. due to magnetic field inhomogeneities
A61B 5/00 - Measuring for diagnostic purposes Identification of persons
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/58 - Calibration of imaging systems, e.g. using test probes
Techniques for compensating magnetic resonance imaging (MRI) data for artefacts caused by motion of a subject being imaged. The techniques include obtaining spatial frequency data obtained by using a magnetic resonance imaging (MRI) system to perform MRI on a patient, the spatial frequency data including first spatial frequency data and second spatial frequency data; determining a transformation using a first image obtained using the first spatial frequency data and a second image obtained using the second spatial frequency data; determining a residual spatial phase; correcting, using the transformation, second spatial frequency data and the residual spatial phase, to obtain corrected second spatial frequency data and a corrected residual spatial phase; and generating a magnetic resonance (MR) image using the corrected second spatial frequency data and the corrected residual spatial phase.
G01V 3/00 - Electric or magnetic prospecting or detectingMeasuring magnetic field characteristics of the earth, e.g. declination or deviation
G01R 33/565 - Correction of image distortions, e.g. due to magnetic field inhomogeneities
G01R 33/56 - Image enhancement or correction, e.g. subtraction or averaging techniques
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
Techniques of prospectively compensating for motion of a subject being imaged by an MRI system, the MRI system comprising a plurality of magnetics components including at least one gradient coil and at least one radio-frequency (RF) coil, the techniques comprising: obtaining first spatial frequency data and second spatial frequency data by operating the MRI system in accordance with a pulse sequence, wherein the pulse sequence is associated with a sampling path that includes at least two non-contiguous portions each for sampling a central region of k-space; determining a transformation using a first image obtained using the first spatial frequency data and a second image obtained using the second spatial frequency data; correcting the pulse sequence using the determined transformation to obtain a corrected pulse sequence; and obtaining additional spatial frequency data in accordance with the corrected pulse sequence.
G01R 33/565 - Correction of image distortions, e.g. due to magnetic field inhomogeneities
G01R 33/56 - Image enhancement or correction, e.g. subtraction or averaging techniques
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
0, at least one gradient coil configured to, when operated, provide spatial encoding of emitted magnetic resonance signals, and at least one radio frequency (RF) component configured to acquire, when operated, the emitted magnetic resonance signals. The method comprises controlling one or more of the plurality of magnetics components in accordance with at least one pulse sequence having a diffusion-weighted gradient encoding period followed by multiple echo periods during which magnetic resonance signals are produced and detected, wherein at least two of the multiple echo periods correspond to respective encoded echoes having an opposite gradient polarity.
A magnetic resonance (MR) imaging system, comprising a magnetics system having a plurality of magnetics components configured to produce magnetic fields for performing magnetic resonance imaging, and a sensor configured to detect electromagnetic interference conducted by a patient into an imaging region of the MR imaging system. The sensor may comprise at least one electrical conductor configured for electrically coupling to the patient. The MR imaging system may further comprise a noise reduction system configured to receive the electromagnetic interference from the sensor and to suppress electromagnetic interference in detected MR signals received by the MR imaging system based on the electromagnetic interference detected by the sensor.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
A61B 5/00 - Measuring for diagnostic purposes Identification of persons
G01R 33/28 - Details of apparatus provided for in groups
G01R 33/422 - Screening of the radiofrequency field
G01R 33/565 - Correction of image distortions, e.g. due to magnetic field inhomogeneities
G01R 33/58 - Calibration of imaging systems, e.g. using test probes
G01R 29/08 - Measuring electromagnetic field characteristics
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/36 - Electrical details, e.g. matching or coupling of the coil to the receiver
G01R 33/381 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
88.
Radio-frequency coil signal chain for a low-field MRI system
Methods and apparatus for reducing noise in RF signal chain circuitry for a low-field magnetic resonance imaging system are provided. A switching circuit in the RF signal chain circuitry may include at least one field effect transistor (FET) configured to operate as an RF switch at an operating frequency of less than 10 MHz. A decoupling circuit may include tuning circuitry coupled across inputs of an amplifier and active feedback circuitry coupled between an output of the amplifier and an input of the amplifier, wherein the active feedback circuitry includes a feedback capacitor configured to reduce a quality factor of an RF coil coupled to the amplifier.
Techniques for compensating for presence of eddy currents during the operation of a magnetic resonance imaging (MRI) system in accordance with a pulse sequence, the pulse sequence comprising a gradient waveform associated with a target gradient field. The techniques include: compensating for presence of eddy currents during operation of the MRI system at least in part by correcting the gradient waveform using a nonlinear function of a characteristic of the gradient waveform to obtain a corrected gradient waveform; and operating the MRI system in accordance with the corrected gradient waveform to generate the target gradient field.
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
G01R 33/24 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
G01R 33/38 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
G01R 33/381 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
G01R 33/3873 - Compensation of inhomogeneities using ferromagnetic bodies
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
According to some aspects, an apparatus is provided comprising a deployable guard device, configured to be coupled to a portable medical imaging device, the deployable guard device further configured to, when deployed, inhibit encroachment within a physical boundary with respect to the portable medical imaging device. According to some aspects, an apparatus is provided comprising a deployable guard device, configured to be coupled to a portable magnetic resonance imaging system, the deployable guard device further configured to, when deployed, demarcate a boundary within which a magnetic field strength of a magnetic field generated by the portable magnetic resonance imaging system equals or exceeds a given threshold.
Provided herein are systems, devices, and methods to facilitate imaging an infant using a magnetic resonance imaging (MRI) device. A system for facilitating imaging an infant using an MRI device is provided herein, the system comprising a radio frequency (RF) coil assembly configured to be coupled to the MRI device and comprising a first RF coil configured to transmit RF signals during MRI and/or be responsive to MR signals generated during MRI and a helmet for supporting at least a portion of the infant's head, and an infant support to support at least a portion of the infant's body and configured to be coupled to the RF coil assembly. Further provided is an apparatus for coupling an infant support to an MRI device.
G01R 33/34 - Constructional details, e.g. resonators
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
A61B 5/00 - Measuring for diagnostic purposes Identification of persons
93.
SYSTEMS, DEVICES, AND METHODS FOR MAGNETIC RESONANCE IMAGING OF INFANTS
Provided herein are systems, devices, and methods to facilitate imaging an infant using a magnetic resonance imaging (MRI) device. A system for facilitating imaging an infant using an MRI device is provided herein, the system comprising a radio frequency (RF) coil assembly configured to be coupled to the MRI device and comprising a first RF coil configured to transmit RF signals during MRI and/or be responsive to MR signals generated during MRI and a helmet for supporting at least a portion of the infant's head, and an infant support to support at least a portion of the infant's body and configured to be coupled to the RF coil assembly. Further provided is an apparatus for coupling an infant support to an MRI device.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
94.
Systems and methods for automated detection in magnetic resonance images
Some aspects include a method of determining change in size of an abnormality in a brain of a patient positioned within a low-field magnetic resonance imaging (MRI) device. The method comprises, while the patient remains positioned within the low-field MRI device, acquiring first and second magnetic resonance (MR) image data of the patient's brain; providing the first and second MR image data as input to a trained statistical classifier to obtain corresponding first and second output; identifying, using the first output, at least one initial value of at least one feature indicative of a size of the abnormality; identifying, using the second output, at least one updated value of the at least one feature; determining the change in the size of the abnormality using the at least one initial value of the at least one feature and the at least one updated value of the at least one feature.
G01R 33/00 - Arrangements or instruments for measuring magnetic variables
A61B 5/00 - Measuring for diagnostic purposes Identification of persons
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/38 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
G01R 33/483 - NMR imaging systems with selection of signal or spectra from particular regions of the volume, e.g. in vivo spectroscopy
G01R 33/56 - Image enhancement or correction, e.g. subtraction or averaging techniques
G06F 18/2411 - Classification techniques relating to the classification model, e.g. parametric or non-parametric approaches based on the proximity to a decision surface, e.g. support vector machines
G06F 18/2413 - Classification techniques relating to the classification model, e.g. parametric or non-parametric approaches based on distances to training or reference patterns
G06V 10/764 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using classification, e.g. of video objects
G06V 10/82 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using neural networks
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
G06N 3/044 - Recurrent networks, e.g. Hopfield networks
Aspects relate to providing radio frequency components responsive to magnetic resonance signals. According to some aspects, a radio frequency component comprises at least one coil having a conductor arranged in a plurality of turns oriented about a region of interest to respond to corresponding magnetic resonant signal components. According to some aspects, the radio frequency component comprises a plurality of coils oriented to respond to corresponding magnetic resonant signal components. According to some aspects, an optimization is used to determine a configuration for at least one radio frequency coil.
A61B 5/00 - Measuring for diagnostic purposes Identification of persons
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/36 - Electrical details, e.g. matching or coupling of the coil to the receiver
G01R 33/381 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
96.
Techniques for dynamic control of a magnetic resonance imaging system
Techniques are described for controlling components of a Magnetic Resonance Imaging (MRI) system with a single controller, such as a Field Programmable Gate Array (FPGA), by dynamically instructing the controller to issue commands to the components using a processor coupled to the controller. According to some aspects, the controller may issue commands to the components of the MRI system whilst actively receiving commands from the processor to be later issued to the components.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
G01R 33/54 - Signal processing systems, e.g. using pulse sequences
97.
Portable magnetic resonance imaging methods and apparatus
0 field for the magnetic resonance imaging system, and a plurality of gradient coils configured to, when operated, generate magnetic fields to provide spatial encoding of emitted magnetic resonance signals, a power system comprising one or more power components configured to provide power to the magnetics system to operate the magnetic resonance imaging system to perform image acquisition, and a base that supports the magnetics system and houses the power system, the base comprising at least one conveyance mechanism allowing the portable magnetic resonance imaging system to be transported to different locations. According to some aspects, the base has a maximum horizontal dimension of less than or equal to approximately 50 inches. According to some aspects, the portable magnetic resonance imaging system weighs less than 1,500 pounds. According to some aspects, the portable magnetic resonance imaging system has a 5-Gauss line that has a maximum dimension of less than or equal to five feet.
G01R 33/36 - Electrical details, e.g. matching or coupling of the coil to the receiver
G01R 33/38 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
G01R 33/34 - Constructional details, e.g. resonators
G01R 33/385 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
G01R 33/383 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
G01R 33/565 - Correction of image distortions, e.g. due to magnetic field inhomogeneities
G01R 33/44 - Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
G01R 33/422 - Screening of the radiofrequency field
G01R 33/3873 - Compensation of inhomogeneities using ferromagnetic bodies
G01R 33/381 - Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
98.
Deep learning techniques for alignment of magnetic resonance images
Generating magnetic resonance (MR) images of a subject from MR data obtained by a magnetic resonance imaging (MRI) system by: generating first and second sets of one or more MR images from first and second input MR data; aligning the first and second sets of MR images using a neural network model comprising first and second neural networks, the aligning comprising: estimating, using the first neural network, a first transformation between the first and second sets of MR images; generating a first updated set of MR images from the second set of MR images using the first transformation; estimating, using the second neural network, a second transformation between the first set and the first updated set of MR images; and aligning the first set of MR images and the second set of MR images at least in part by using the first transformation and the second transformation.
G06K 9/00 - Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
G06N 3/04 - Architecture, e.g. interconnection topology
Techniques for generating magnetic resonance (MR) images of a subject from MR data obtained by a magnetic resonance imaging (MRI) system, the techniques include: obtaining input MR spatial frequency data obtained by imaging the subject using the MRI system; generating an MR image of the subject from the input MR spatial frequency data using a neural network model comprising: a pre-reconstruction neural network configured to process the input MR spatial frequency data; a reconstruction neural network configured to generate at least one initial image of the subject from output of the pre-reconstruction neural network; and a post-reconstruction neural network configured to generate the MR image of the subject from the at least one initial image of the subject.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
G06N 3/04 - Architecture, e.g. interconnection topology
G06V 10/88 - Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters
G06V 10/75 - Organisation of the matching processes, e.g. simultaneous or sequential comparisons of image or video featuresCoarse-fine approaches, e.g. multi-scale approachesImage or video pattern matchingProximity measures in feature spaces using context analysisSelection of dictionaries
100.
Self ensembling techniques for generating magnetic resonance images from spatial frequency data
Techniques for generating magnetic resonance (MR) images of a subject from MR data obtained by a magnetic resonance imaging (MRI) system, the techniques including: obtaining input MR data obtained by imaging the subject using the MRI system; generating a plurality of transformed input MR data instances by applying a respective first plurality of transformations to the input MR data; generating a plurality of MR images from the plurality of transformed input MR data instances and the input MR data using a non-linear MR image reconstruction technique; generating an ensembled MR image from the plurality of MR images at least in part by: applying a second plurality of transformations to the plurality of MR images to obtain a plurality of transformed MR images; and combining the plurality of transformed MR images to obtain the ensembled MR image; and outputting the ensembled MR image.
A61B 5/055 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fieldsMeasuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/561 - Image enhancement or correction, e.g. subtraction or averaging techniques by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
G06N 3/04 - Architecture, e.g. interconnection topology
patents
