A method of misalignment correction in an imaging system is disclosed. The method includes providing a collimator and a detector having a digitized pixel grid, illuminating the collimator with a flood light source, and recording signal intensities in each pixel of the digitized pixel grid. The signal intensities are caused by the illuminating of the collimator. The method further includes deriving a descriptor from the recorded signal intensities, generating a series of offsets to be introduced to the digitized pixel grid, finding a selected offset from the series of offsets that optimizes the descriptor, and regenerating the digitized pixel grid based on an actual offset derived from the selected offset.
A method includes obtaining an image having M sections and each section having N pixels. The method further includes deriving N sub-images from the image, wherein each sub-image has M sections and each section has N pixels. The i-th pixel of the j-th section of the i-th sub-image has a pixel value equal to a pixel value of the i-th pixel of the j-th section of the image and other pixels of the j-th section of the i-th sub-image are set to 0, where i traverses from 1 to N, and j traverses from 1 to M. The method further includes providing N projection patterns and calculating a projection for each sub-image by performing convolution of the respective sub-image with a corresponding one of the projection patterns, thereby obtaining N projected sub-images. The method further includes summing up the N projected sub-images, thereby obtaining a projection of the image.
A method of imaging reconstruction includes providing a detector and a collimator, operating the detector to acquire a measured image of a target object from photons passing through the collimator, partitioning the collimator such that the collimator can be represented by a first matrix, providing an initial estimated image of the target object, and calculating an estimated image of the target object based on the measured image and the first matrix. The calculating of the estimated image includes an iteration using the initial estimated image as a starting point. The method also includes partitioning the collimator such that the collimator can be represented by a second matrix larger than the first matrix, and calculating a refined estimated image of the target object based on the measured image and the second matrix. The calculating of the refined estimated image includes an iteration using the estimated image as a starting point.
A medical imaging system includes a collimator having a plurality of collimator parts configured to filter radiation emitted from a target object; a detector base; and a detector having a plurality of detector tiles, configured to acquire an image of the target object by detecting radiation that has passed through the plurality of collimator parts, wherein at least one of the plurality of detector tiles is tilted with respect to the detector base.
A method includes providing a target object and acquiring measured images of the target object. Each of the measured images is acquired by filtering radiation from the target object by a mask having multiple holes and detecting filtered radiation by a detector. The method further includes providing an estimated image of the target object and calculating an updating factor for each of the measured images. The calculating of the updating factor includes partitioning a mathematical representation of the mask into multiple first regions; for each of the first regions, deriving a separate forward projection from the estimated image of the target object and the respective first region; and comparing the respective measured image of the target object with the forward projections. The method further includes updating the estimated image of the target object based on the updating factors.
A breast imaging system for examining a breast on a chest of a patient comprises first one or more shielding devices configured for placement on a first side of the breast and a first collimator and a first detector configured for placement on the first side of the breast and at a position that is further away from the breast and from the chest than the first one or more shielding devices are.
A radiation-based imaging system includes a collimator configured to filter radiation emitted from a target object, the collimator including a plurality of apertures non-uniformly distributed on the collimator. A largest acceptance angle of the plurality of apertures is not larger than 15°. The radiation-based imaging system further includes a detector for detecting the radiation that has passed through the collimator. The collimator is spaced from the detector such that a point on a top surface of the detector that faces the collimator is simultaneously illuminated by two or more of the plurality of apertures.
A radiation-based imaging system includes a collimator configured to filter radiation emitted from a target object, the collimator including a plurality of apertures non-uniformly distributed on the collimator. A largest acceptance angle of the plurality of apertures is not larger than 15°. The radiation-based imaging system further includes a detector for detecting the radiation that has passed through the collimator. The collimator is spaced from the detector such that a point on a top surface of the detector that faces the collimator is simultaneously illuminated by two or more of the plurality of apertures.
A medical imaging system includes a collimator configured to filter radiation emitted from a subject; and a detector configured to detector radiation that has passed through the collimator, wherein the detector includes a plurality of detector tiles and at least one detector tile is moveable with respect to other detector tiles, wherein top surfaces of the plurality of detector tiles are capable to be configured as being coplanar.
A medical imaging system includes a collimator configured to filter radiation emitted from a subject; and a detector configured to detector radiation that has passed through the collimator, wherein the detector includes a plurality of detector tiles and at least one detector tile is moveable with respect to other detector tiles, wherein top surfaces of the plurality of detector tiles are capable to be configured as being coplanar.
G01N 23/20 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by using diffraction of the radiation by the materials, e.g. for investigating crystal structureInvestigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materialsInvestigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by using reflection of the radiation by the materials
G01N 23/02 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by transmitting the radiation through the material
G01N 23/083 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by transmitting the radiation through the material and measuring the absorption the radiation being X-rays
G01N 23/20008 - Constructional details of analysers, e.g. characterised by X-ray source, detector or optical systemAccessories thereforPreparing specimens therefor
11.
Image reconstruction method for collimator and detector based medical imaging systems
According to various embodiments, the present disclosure provides a method of imaging reconstruction. The method of imaging reconstruction includes providing a target object, a detector, and a mask disposed between the target object and the detector; acquiring a measured image of the target object by the detector; providing an estimated image of the target object; partitioning the mask into multiple regions; for each of the regions, deriving a forward projection from the estimated image of the target object and the respective region, thereby acquiring multiple forward projections; comparing the measured image of the target object with the forward projections; and updating the estimated image of the target object based on a result of the comparing.
According to various embodiments, the present disclosure provides a collimator for medical imaging. The collimator includes a perforated plate with a top surface and a bottom surface and holes distributed on the perforated plate. The holes are arranged in a plurality of groups. The plurality of groups forms a first coded aperture pattern and the holes in each of the plurality of groups form a second coded aperture pattern.
A medical imaging system includes a first collimator configured to filter radiation emitted from a subject, a first detector configured to detect radiation that has passed through the first collimator, a second collimator configured to filter radiation emitted from the subject, wherein the first collimator partially blocks a field of view (FOV) of the second collimator, and a second detector configured to detect radiation that has passed through the second collimator.
A medical imaging system includes a first collimator configured to filter radiation emitted from a subject, a first detector configured to detect radiation that has passed through the first collimator, a second collimator configured to filter radiation emitted from the subject, wherein the first collimator partially blocks a field of view (FOV) of the second collimator, and a second detector configured to detect radiation that has passed through the second collimator.
A61B 6/08 - Auxiliary means for directing the radiation beam to a particular spot, e.g. using light beams
G01N 23/02 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by transmitting the radiation through the material
G01N 23/20008 - Constructional details of analysers, e.g. characterised by X-ray source, detector or optical systemAccessories thereforPreparing specimens therefor
G21K 3/00 - Ionising radiation filters, e.g. X-ray filters
09 - Scientific and electric apparatus and instruments
10 - Medical apparatus and instruments
42 - Scientific, technological and industrial services, research and design
Goods & Services
Imaging apparatus incorporating collimators; imaging apparatus for scientific research; imaging apparatus for photography; imaging apparatus and software sold as a unit for scientific research; downloadable imaging software; downloadable medical imaging software; downloadable software for processing digital images; downloadable software for processing digital images of the anatomy for diagnosis and treatment. Medical apparatus and instruments; medical imaging apparatus; medical imaging apparatus incorporating medical imaging software; medical imaging apparatus incorporating collimators and medical imaging software. Advanced product research in the field of imaging technology; advanced product research in the field of medical imaging technology; providing temporary use of non-downloadable software for use in medical imaging; providing temporary use of non-downloadable software for use in imaging.
09 - Scientific and electric apparatus and instruments
10 - Medical apparatus and instruments
Goods & Services
Imaging apparatus in the form of collimators to filter radiation or light rays for scientific research or laboratory use; imaging apparatus for imaging radiation sources used in scientific research; imaging apparatus incorporating light filtering devices used in photography for scientific or laboratory use; imaging apparatus for imaging of radiation sources and imaging software sold as a unit for scientific research; downloadable imaging software; downloadable medical imaging software; downloadable software for processing digital images; downloadable software for processing digital images of the anatomy for diagnosis and treatment Medical imaging apparatus; medical imaging apparatus incorporating medical imaging software; medical imaging apparatus incorporating collimators and medical imaging software
09 - Scientific and electric apparatus and instruments
10 - Medical apparatus and instruments
Goods & Services
Imaging apparatus in the form of collimators to filter radiation or light rays for scientific research or laboratory use; imaging apparatus for imaging radiation sources used in scientific research; imaging apparatus incorporating light filtering devices used in photography for scientific or laboratory use; imaging apparatus for imaging of radiation sources and imaging software sold as a unit for scientific research; downloadable imaging software; downloadable medical imaging software; downloadable software for processing digital images; downloadable software for processing digital images of the anatomy for diagnosis and treatment Medical imaging apparatus; medical imaging apparatus incorporating medical imaging software; medical imaging apparatus incorporating collimators and medical imaging software
18.
Positron emission tomography imaging method and system
The technical solution as put forth by the present invention comprises a computer imaging system and detectors arranged around the detected object for collecting gamma photons from positron annihilation events. The key is a multi-pinhole plate placed between the detected object and the detectors, and the multi-pinhole plate can be a coded aperture mask coded by using a function h(x,y). The gamma photons generated from the annihilation events inside the detected object are absorbed by the detector after being collimated by the multi-pinhole plate. Accordingly, after the detectors have performed detection at multiple angles, the result is transmitted to the computer imaging system, and quasi three-dimensional images are generated after being processed by the disclosed algorithm. Furthermore, the quasi three-dimensional images generate secondary projection images and, after adjustment, generate sinograms, and finally three-dimensional tomographic images are reconstructed from multiple sinograms.
