The present invention relates to large area field emission devices based on the incorporation of macroscopic, microscopic, and nanoscopic field enhancement features and a designed forced current sharing matrix layer to enable a stable high-current density long-life field emission device. The present invention pertains to a wide range of field emission sources and is not limited to a specific field emission technology. The invention is described as an X-ray electron source but can be applied to any application requiring a high current density electron source.
An X-ray imaging apparatus comprises a digital X-ray detector housed in a radiation shielded enclosure with multiple pinhole apertures in the front panel of the housing. An X-ray source illuminates a target and X-rays are backscattered towards the X-ray imaging apparatus. The multiple pinhole apertures arranged in a pattern so that each pinhole generates a respective pinhole image on the X-ray detector. The size of each image is controlled by the thickness of the front panel and the width of the pinhole aperture (acting as optical stops), and the distance to the X-ray detector, and these values are selected to prevent overlap between any pair of pinhole images on the X-ray detector. An image processor is used to generate a synthetic combined image of the object form the multiple pinhole images.
An X-ray imaging apparatus comprises a digital X-ray detector housed in a radiation shielded enclosure with multiple pinhole apertures in the front panel of the housing. An X-ray source illuminates a target and X-rays are backscattered towards the X-ray imaging apparatus. The multiple pinhole apertures arranged in a pattern so that each pinhole generates a respective pinhole image on the X-ray detector. The size of each image is controlled by the thickness of the front panel and the width of the pinhole aperture (acting as optical stops), and the distance to the X-ray detector, and these values are selected to prevent overlap between any pair of pinhole images on the X-ray detector. An image processor is used to generate a synthetic combined image of the object form the multiple pinhole images.
A device and method for creating beam formed X-Ray radiation using radio frequency (RF) modulated field emission X-ray sources is described. A radio frequency RF source generates a RF control signal which is supplied to an array of phase delay elements to generate multiple individually controlled phase delayed RF signals. These are then directly provided to each of a plurality of field emission sources (via a matching circuit) to generate a plurality of RF modulated electron current, or beam, each at the same frequency and phase delay of the phase delayed RF signals. Each of the electron beams impacts a target anode to generate X-rays also at the same frequency and phase delay of the phase delayed RF signals. By controlling each of the phase delay elements a beamformed X-ray radiation pattern can be generated.
The present invention relates to large area field emission devices based on the incorporation of macroscopic, microscopic, and nanoscopic field enhancement features and a designed forced current sharing matrix layer to enable a stable high-current density long-life field emission device. The present invention pertains to a wide range of field emission sources and is not limited to a specific field emission technology. The invention is described as an X-ray electron source but can be applied to any application requiring a high current density electron source.
A device and method for creating controlled radio frequency (RF) modulated X-ray radiation is described. The device includes an anode housed within a vacuum enclosure which acts to accelerate and convert an electron beam into X-ray radiation. A RF enclosure is housed within the vacuum enclosure and houses a field emission device, such as a carbon nanotube field emission device or similar cold cathode field emission device. The field emission device is biased to emit the electron beam from a field emission cathode via an extraction electrode in the RF enclosure towards the anode. Additionally an RF impedance matching and coupling circuit is connected electrically to the field emission device. The field emission device is thus directly driven with a RF signal to produce an RF modulated electron current to produce an RF modulated X-ray radiation.
A device and method for creating beam formed X-Ray radiation using radio frequency (RF) modulated field emission X-ray sources is described. A radio frequency RF source generates a RF control signal which is supplied to an array of phase delay elements to generate multiple individually controlled phase delayed RF signals. These are then directly provided to each of a plurality of field emission sources (via a matching circuit) to generate a plurality of RF modulated electron current, or beam, each at the same frequency and phase delay of the phase delayed RF signals. Each of the electron beams impacts a target anode to generate X-rays also at the same frequency and phase delay of the phase delayed RF signals. By controlling each of the phase delay elements a beamformed X-ray radiation pattern can be generated.
The present invention relates to large area field emission devices based on the incorporation of macroscopic, microscopic, and nanoscopic field enhancement features and a designed forced current sharing matrix layer to enable a stable high-current density long-life field emission device. The present invention pertains to a wide range of field emission sources and is not limited to a specific field emission technology. The invention is described as an X-ray electron source but can be applied to any application requiring a high current density electron source.
A device and method for creating controlled radio frequency (RF) modulated X-ray radiation is described. The device includes an anode housed within a vacuum enclosure which acts to accelerate and convert an electron beam into X-ray radiation. A RF enclosure is housed within the vacuum enclosure and houses a field emission device, such as a carbon nanotube field emission device or similar cold cathode field emission device. The field emission device is biased to emit the electron beam from a field emission cathode via an extraction electrode in the RF enclosure towards the anode. Additionally an RF impedance matching and coupling circuit is connected electrically to the field emission device. The field emission device is thus directly driven with a RF signal to produce an RF modulated electron current to produce an RF modulated X- ray radiation.
An articulated arm to suspend an X-ray head from a support section in a radiographic imaging apparatus comprising two pairs of linkages separated and joined to an intermediate linkage wherein the proximal end of the first pair of linkages is connected to the support section and the distal end of the second pair of linkages is connected to the X-ray head, and further wherein the linkages in the first pair of linkages are parallel and rotatable about the connection to the support section, the linkages in the second pair of linkages are parallel and rotatable about the intermediate linkage, and whereby a rotational orientation of a mounting for the X-ray head about an axis which is parallel to the axes about which the first pair of linkages are rotatable remains constant when the first pair of linkages is rotated relative to the support section and/or the second pair of linkages is rotated relative to the intermediate linkage.
A61B 6/00 - Apparatus or devices for radiation diagnosisApparatus or devices for radiation diagnosis combined with radiation therapy equipment
F16M 11/10 - Means for attachment of apparatusMeans allowing adjustment of the apparatus relatively to the stand allowing pivoting around a horizontal axis
F16M 11/42 - Stands or trestles as supports for apparatus or articles placed thereon with arrangement for propelling the support
F16M 11/18 - Heads with mechanism for moving the apparatus relatively to the stand
F16M 11/12 - Means for attachment of apparatusMeans allowing adjustment of the apparatus relatively to the stand allowing pivoting in more than one direction
12.
Mobile radiographic imaging apparatus having counterbalanced slewable arm
There is disclosed a mobile radiographic imaging apparatus including a component operable to emit radiation for imaging a subject, an arm rotatably connected at a proximal end thereof to a body section of the apparatus, such that it is supported by the body section and can slew relative to the body section about an upright axis, and to a distal end of which said component is connected, and a generator assembly arranged in the body section and including a generator arranged in the casing and electrically connected to said component, the apparatus being configured such that the generator assembly rotates with the arm, about said axis, wherein the generator assembly has a centre of mass which is radially offset from said axis in a second direction that is substantially opposite to said first direction.
F16M 11/08 - Means for attachment of apparatusMeans allowing adjustment of the apparatus relatively to the stand allowing pivoting around a vertical axis
F16M 11/12 - Means for attachment of apparatusMeans allowing adjustment of the apparatus relatively to the stand allowing pivoting in more than one direction
F16M 11/20 - Undercarriages with or without wheels
There is disclosed a component of or for a radiographic imaging apparatus, the component comprising a main body which includes a source of radiation, a collimator operable to adjust the size of an aperture in the main body and thus one or more transverse dimensions of a beam of the radiation emittable from the main body section, along an axis, for imaging a subject, and a pair of handles, the handles being spaced apart and projecting from the main body in a direction substantially parallel to the axis, the handles being graspable by respective hands of an operator whereby the component can be manipulated to orientate the beam, wherein either or each of the handles is configured with an adjustor which is manually operable to effect adjustment of the aperture size.
There is disclosed a grip for inclusion in a mobile apparatus comprising ground-engaging wheels and a braking system arranged to brake at least one ground-engaging wheel of the apparatus, the grip being configured with at least one actuator arranged such that it can be engaged by a hand of the person grasping the grip so as to disengage the braking system, whereupon the person can manoeuvre the apparatus over the ground via the grip with said hand.
There is disclosed a mobile radiographic imaging apparatus including a component operable to emit radiation for imaging a subject, an arm rotatably connected at a proximal end thereof to a body section of the apparatus, such that it is supported by the body section and can slew relative to the body section about an upright axis, and to a distal end of which said component is connected, and a generator assembly arranged in the body section and including a generator arranged in the casing and electrically connected to said component, the apparatus being configured such that the generator assembly rotates with the arm, about said axis, wherein the generator assembly has a centre of mass which is radially offset from said axis in a second direction that is substantially opposite to said first direction.
A keeper for cabling comprising a first part configured to be fixed to a first component, a second part which can be fixed to a second component which rotates relative to the first component, the first and second parts being configured to hold a section of the cabling extending between the first and second parts in a manner such that a radially outer end of said section is fixed with respect to said radially outer wall and a radially inner end of said section is fixed with respect to said radially inner wall and there is a bend in said section at a position between the ends thereof, the keeper further comprising a guide configured to occupy the housing so as to be rotatable therein.
B65H 75/40 - Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material mobile or transportable
B65H 75/42 - Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material mobile or transportable attached to, or forming part of, mobile tools or machines
An articulated arm to suspend an X-ray head from a support section in a radiographic imaging apparatus comprising two pairs of linkages separated and joined to an intermediate linkage wherein the proximal end of the first pair of linkages is connected to the support section and the distal end of the second pair of linkages is connected to the X-ray head, and further wherein the linkages in the first pair of linkages are parallel and rotatable about the connection to the support section, the linkages in the second pair of linkages are parallel and rotatable about the intermediate linkage, and whereby a rotational orientation of a mounting for the X-ray head about an axis which is parallel to the axes about which the first pair of linkages are rotatable remains constant when the first pair of linkages is rotated relative to the support section and/or the second pair of linkages is rotated relative to the intermediate linkage.
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