Abstract: A computed tomography (CT) imaging system includes a detector array configured to detect X-ray projections. The detector array includes a semiconductor sensor array having a plurality of sensors. Each sensor includes a first surface, a second surface, a substrate, and a readout electronics unit. The first surface has a high-voltage bias and includes a first dopant and can receive the X-ray projections. The second surface is opposite the first surface and includes a plurality of sensing regions of a second dopant. The second surface has a low-voltage bias and is configured to collect charges from the X-ray projections. The substrate includes a semiconductor material with a resistivity of at least five kiloohm centimeters and is positioned between the first and second surfaces. The readout electronics unit is positioned between the sensing regions. A surface area of the readout electronics unit is less than one percent of the second surface.

Abstract: A system and method for supporting calibration of an X-ray imaging system, wherein the X-ray imaging system comprises a multi-bin photon counting X-ray detector having multiple energy bin thresholds. The method includes performing a set of X-ray attenuation measurements or measurement scans of at least one object, using different settings of the energy bin thresholds and obtaining information about material composition related to the object(s). The method further includes determining, for each X-ray attenuation measurement or measurement scan, a value of at least one performance metric related to the X-ray imaging system and selecting a custom set of energy bin thresholds based on the determined values of the performance metrics over the set of X-ray attenuation measurements or measurement scans. Also, the method includes determining calibration data coupling the selected custom set of energy bin thresholds to at least the information about material composition.

Abstract: Systems are provided for a computed tomography system, comprising a gantry configured to rotate around an axis of rotation and a detector array comprised of a plurality of photon-counting computed tomography (PCCT) detector units configured to be rotated around the axis of rotation by the gantry, wherein a stacking axis of least one of the plurality of PCCT detector arrays is positioned at an angle with respect to the axis of rotation.

Abstract: There is provided an X-ray imaging system having an X-ray source, an X-ray detector and a collimator assembly in the X-ray path between the X-ray source and the X-ray detector. The X-ray detector comprises a plurality of detector modules arranged side-by-side and adapted to be oriented towards the X-ray source, the detector modules being arranged side-by-side along a direction substantially orthogonal to the direction of incoming X-rays. The collimator assembly is based on a plurality of spaced collimator plates arranged side-by-side in a direction coinciding with the direction of the detector modules. The collimator assembly further comprises a physically stabilizing lateral support structure arranged in a lateral plane extending in a direction substantially orthogonal to the direction of incoming X-rays.

Abstract: There is provided an X-ray imaging system having an X-ray source, an X-ray detector and a collimator assembly in the X-ray path between the X-ray source and the X-ray detector. The X-ray detector comprises a plurality of detector modules arranged side-by-side and adapted to be oriented towards the X-ray source, the detector modules being arranged side-by-side along a direction substantially orthogonal to the direction of incoming X-rays. The collimator assembly is based on a plurality of spaced collimator plates arranged side-by-side in a direction coinciding with the direction of the detector modules. The collimator assembly further comprises a physically stabilizing lateral support structure arranged in a lateral plane extending in a direction substantially orthogonal to the direction of incoming X-rays.

Abstract: A silicon photomultiplier (SiPM) based detection system includes a plurality of scintillators, SiPMs, a front end circuit, adjustment circuits, and an energy and position processing unit. The SiPMs have a non-linear response to energy deposition corresponding to radiation detection. The adjustment circuit is configured to receive an analog signal from SiPMs, and to provide an adjusted analog signal, which is configured to simulate a signal corresponding to a linear response. The energy and position processing unit utilizes the adjusted signal to provide energy and position information of detected events in the detector block.

Abstract: A silicon photomultiplier (SiPM) based detection system includes a plurality of scintillators, SiPMs, a front end circuit, adjustment circuits, and an energy and position processing unit. The SiPMs have a non-linear response to energy deposition corresponding to radiation detection. The adjustment circuit is configured to receive an analog signal from SiPMs, and to provide an adjusted analog signal, which is configured to simulate a signal corresponding to a linear response. The energy and position processing unit utilizes the adjusted signal to provide energy and position information of detected events in the detector block.

Abstract: A two dimensional (2D) collimator assembly and a detector system employing a 2D collimator assembly. More specifically, a collimator assembly is provided, having elements extending in the x and z-planes of a detector system. The 2D collimator assembly includes a number of blades arranged in parallel. Each of the blades includes fins extending from one or both sides of the body of the blade. The fins are coupled to each adjacent array to form the 2D collimator assembly.

Abstract: An X-ray sensitive coating (22) for a flat panel direct conversion X-ray detector for medical or industrial imaging. A composite particle-in-binder (PIB) material (22) may contain X-ray photoconductive particles (23) such as PbO (lead monoxide) in a binder of polyimide (23). This PIB material may be prepared in precursor paste form, and applied as a coating (22) onto a thin film transistor array (26) having a storage capacitor (31) at each pixel (30). The coating (22) is cured, and an electrically conducting layer (34) is applied to the exposed surface of the coating (22), to provide a bias voltage. X-ray photons striking the photoconductive particles (23) cause localized electrical conduction proportional to the number of photons. This charges respective capacitors (31) that provide image data input to a computer.

Abstract: A hybrid x-ray detector includes: a first detector that is adapted to receive x-rays, the first detector absorbs a first portion of the x-rays and allows a second portion of the x-rays to pass through the first detector; and a second detector that is adapted to receive the second portion of the x-rays. A radiation imaging system includes: an x-ray source that produces x-rays; and an image detector assembly that is adapted to receive the x-rays, the image detector assembly having a hybrid x-ray detector that includes: a first detector that is adapted to receive the x-rays, the first detector absorbs a first portion of the x-rays and allows a second portion of the x-rays to pass through the first detector; a second detector that is adapted to receive the second portion of the x-rays; and an x-ray source.