Abstract: A radiation detector having an energy-integrating detection layer and at least one direct-conversion detection layer is described. In certain embodiments, the direct-conversion layer is impacted first by an incident X-ray beam, such that X-ray photons stopped at the direct-conversion layer are generally lower in energy than those which reach the energy-integrating detection layer. The data acquired using the direct-conversion layers and energy-integrating layers may be combined to provide additional spectral discrimination, such as in material decomposition or contrast-enhancement applications.

Abstract: Disclosed are methods and devices for estimating object scatter and/or internal scatter in a multi-level photon-counting x-ray detector, as well as x-ray tomographic imaging while correcting for object and internal scatter. The x-ray detector has at least two layers of detector diodes mounted in an edge-on geometry, e.g. designed for 1) estimating the object scatter contribution to the counts in a top layer of the at least two layers based on difference(s) in counts between the top layer and lower layer(s) under the assumption the object scatter has a slowly varying spatial distribution, and/or 2) estimating counts from reabsorption of photons that have Compton scattered inside the detector based on selectively blinding some detector elements from primary radiation by placing a highly attenuating beam stop on top of the detector elements, in lower layer(s) or in both top layer and lower layer(s), and measuring the counts in those detector elements.

Abstract: A collimator for an imaging detector assembly of a computed tomography imaging system is provided. The collimator includes a collimator module that includes a primary collimation grid having a first edge and a second edge. The primary collimation grid includes multiple radiation absorbing elements spaced apart from each other and configured to provide primary beam collimation. A first radiation absorbing element is disposed on the first edge and a second radiation absorbing element is disposed on the second edge. The collimator module includes multiple plates located on a side of the primary collimation grid and configured to absorb scattered radiation. A respective plate of the multiple plates is disposed over a respective radiation absorbing element of the multiple radiation absorbing elements of the primary collimation grid except the second radiation absorbing element disposed on the second edge of the primary collimation grid.

Abstract: Disclosed are methods and devices for estimating object scatter and/or internal scatter in a multi-level photon-counting x-ray detector, as well as x-ray tomographic imaging while correcting for object and internal scatter. The x-ray detector has at least two layers of detector diodes mounted in an edge-on geometry, e.g. designed for 1) estimating the object scatter contribution to the counts in a top layer of the at least two layers based on difference(s) in counts between the top layer and lower layer(s) under the assumption the object scatter has a slowly varying spatial distribution, and/or 2) estimating counts from reabsorption of photons that have Compton scattered inside the detector based on selectively blinding some detector elements from primary radiation by placing a highly attenuating beam stop on top of the detector elements, in lower layer(s) or in both top layer and lower layer(s), and measuring the counts in those detector elements.

Abstract: Disclosed are methods and devices for estimating object scatter and/or internal scatter in a multi-level photon-counting x-ray detector, as well as x-ray tomographic imaging while correcting for object and internal scatter. The x-ray detector has at least two layers of detector diodes mounted in an edge-on geometry, e.g. designed for 1) estimating the object scatter contribution to the counts in a top layer of the at least two layers based on difference(s) in counts between the top layer and lower layer(s) under the assumption the object scatter has a slowly varying spatial distribution, and/or 2) estimating counts from reabsorption of photons that have Compton scattered inside the detector based on selectively blinding some detector elements from primary radiation by placing a highly attenuating beam stop on top of the detector elements, in lower layer(s) or in both top layer and lower layer(s), and measuring the counts in those detector elements.

Abstract: A collimator for an imaging detector assembly of a computed tomography imaging system is provided. The collimator includes a collimator module that includes a primary collimation grid having a first edge and a second edge. The primary collimation grid includes multiple radiation absorbing elements spaced apart from each other and configured to provide primary beam collimation. A first radiation absorbing element is disposed on the first edge and a second radiation absorbing element is disposed on the second edge. The collimator module includes multiple plates located on a side of the primary collimation grid and configured to absorb scattered radiation. A respective plate of the multiple plates is disposed over a respective radiation absorbing element of the multiple radiation absorbing elements of the primary collimation grid except the second radiation absorbing element disposed on the second edge of the primary collimation grid.

Abstract: A radiation detector having an energy-integrating detection layer and at least one direct-conversion detection layer is described. In certain embodiments, the direct-conversion layer is impacted first by an incident X-ray beam, such that X-ray photons stopped at the direct-conversion layer are generally lower in energy than those which reach the energy-integrating detection layer. The data acquired using the direct-conversion layers and energy-integrating layers may be combined to provide additional spectral discrimination, such as in material decomposition or contrast-enhancement applications.

Abstract: An apparatus for capturing images is described herein. The apparatus may include a generator to generate energy to be emitted at an imaging device. The apparatus may also include a controller, at least partially including hardware logic, to direct the generator to ramp energy emitted at the imaging device from a first energy level to a second energy level in a ramping waveform.

Abstract: A radiation detector includes a scintillator layer configured to absorb radiation emitted from a radiation source and to emit optical photons in response to the absorbed radiation. The radiation detector also includes a photodetector layer configured to absorb the optical photons emitted by the scintillator layer. The radiation detector further includes a reflector configured to reflect the optical photons emitted by the scintillator layer towards the photodetector layer and to absorb select wavelengths of optical photons associated with an afterglow emitted by the scintillator layer.

Abstract: A CT system includes a rotatable gantry having an opening to receive an object to be scanned, an x-ray source configured to project an x-ray beam toward the object, and a detector array configured to detect x-rays passing through the object. The detector array includes a first array of pixels positioned to receive x-rays that pass to the detector array outside a first field-of-view (FOV) to a second FOV, the first array of pixels providing a first resolution, and a second array of pixels positioned to receive x-rays passing through the first FOV, the second array of pixels providing a second resolution that is different from the first resolution. The system includes a data acquisition system (DAS) configured to receive outputs from the detector array, and a computer programmed to acquire projections of imaging data of the object, and generate an image of the object using the imaging data.

Abstract: A radiation detector includes a scintillator layer configured to absorb radiation emitted from a radiation source and to emit optical photons in response to the absorbed radiation. The radiation detector also includes a photodetector layer configured to absorb the optical photons emitted by the scintillator layer. The radiation detector further includes a reflector configured to reflect the optical photons emitted by the scintillator layer towards the photodetector layer and to absorb select wavelengths of optical photons associated with an afterglow emitted by the scintillator layer.

Abstract: An x-ray detector assembly includes a first flat panel digital projection detector and a second flat panel digital projection detector. The x-ray detector assembly further includes a first detector mounting structure configured to align the first flat panel digital projection detector in a first position to block the second flat panel digital projection detector from receiving x-rays emitting from an x-ray source toward the second flat panel digital projection detector in an x-ray penetration direction.

Abstract: An x-ray detector assembly includes a curvilinear detector assembly that has a first side section that includes a first plurality of detector modules, a second side section that includes a second plurality of detector modules, and a third section that includes a third plurality of detector modules. The third section is positioned between the first and second side sections in a channel direction. The x-ray detector assembly also includes a first flat panel digital projection detector and a first detector mounting structure that is configured to align the first flat panel digital projection detector in a first position to block the third section of the curvilinear detector assembly from receiving x-rays emitting from an x-ray source toward the curvilinear detector assembly in the x-ray penetration direction.

Abstract: An x-ray detector assembly includes a first curvilinear detector assembly comprising a first plurality of detector modules, a second curvilinear detector assembly comprising a second plurality of detector modules, and a first flat panel digital projection detector arranged between the first and second curvilinear detector assemblies such that a first end of the first flat panel digital projection detector is coupled to an inner end of the first curvilinear detector assembly and a second end of the first flat panel projection detector is coupled to an inner end of the second curvilinear detector assembly.

Abstract: A CT system includes a rotatable gantry having an opening to receive an object to be scanned, an x-ray source configured to project an x-ray beam toward the object, and a detector array configured to detect x-rays passing through the object. The detector array includes a first array of pixels positioned to receive x-rays that pass to the detector array outside a first field-of-view (FOV) to a second FOV, the first array of pixels providing a first resolution, and a second array of pixels positioned to receive x-rays passing through the first FOV, the second array of pixels providing a second resolution that is different from the first resolution. The system includes a data acquisition system (DAS) configured to receive outputs from the detector array, and a computer programmed to acquire projections of imaging data of the object, and generate an image of the object using the imaging data.

Abstract: A method includes inserting a first x-ray detector between a second x-ray detector and an object.

Abstract: A detector is provided for an x-ray imaging system. The detector includes a photosensitive region with an area less than half of an area of a scintillator cell, from which the photosensitive region receives light.

Abstract: An x-ray detector assembly includes a first flat panel digital projection detector and a second flat panel digital projection detector. The x-ray detector assembly further includes a first detector mounting structure configured to align the first flat panel digital projection detector in a first position to block the second flat panel digital projection detector from receiving x-rays emitting from an x-ray source toward the second flat panel digital projection detector in an x-ray penetration direction.

Abstract: An x-ray detector assembly includes a curvilinear detector assembly that has a first side section that includes a first plurality of detector modules, a second side section that includes a second plurality of detector modules, and a third section that includes a third plurality of detector modules. The third section is positioned between the first and second side sections in a channel direction. The x-ray detector assembly also includes a first flat panel digital projection detector and a first detector mounting structure that is configured to align the first flat panel digital projection detector in a first position to block the third section of the curvilinear detector assembly from receiving x-rays emitting from an x-ray source toward the curvilinear detector assembly in the x-ray penetration direction.

Abstract: An x-ray detector assembly includes a first curvilinear detector assembly comprising a first plurality of detector modules, a second curvilinear detector assembly comprising a second plurality of detector modules, and a first flat panel digital projection detector arranged between the first and second curvilinear detector assemblies such that a first end of the first flat panel digital projection detector is coupled to an inner end of the first curvilinear detector assembly and a second end of the first flat panel projection detector is coupled to an inner end of the second curvilinear detector assembly.