An X-ray imaging detector (102) is proposed, wherein the X-ray imaging detector comprises an X-ray converter (103) for converting X-ray radiation into electrical charges. The X-ray imaging detector further comprises a detector plate (104) for collecting the electrical charges generated by the X-ray converter and for generating an image. In addition, the X-ray imaging detector comprises a structured plate (105) for modulating the intensity of backscattered X-ray radiation, wherein the structured plate is arranged at a side of the detector plate opposite the side of the X-ray converter. Moreover, the X-ray imaging detector comprises a data processing system, which is configured for mitigating image distortions caused by backscattered X-ray radiation. Thereto, the data processing system uses information about the structured plate.

A positron emission tomography apparatus according to an embodiment includes a plurality of positron emission tomography (PET) detector entities and processing circuitry. The plurality of PET detector entities are arranged in a ring formation. The processing circuitry is configured: to obtain, with respect to each of the plurality of PET detector entities, state information indicating a state of the PET detector entity; to detect an abnormality when an index value indicating a state of any individual or a whole of the plurality of PET detector entities exceeds a threshold value on the basis of the state information; and to detect a state in which the abnormality is not detected on the basis of the state information, but an index value indicating states of at least two of the plurality of PET detector entities is different from an index value indicating states of at least two other PET detector entities.

The radiation imaging apparatus is provided that includes a radiation detector including a pixel array in which a plurality of pixels being capable of detecting radiation as electric signals are arranged, the radiation transmitted through an AEC sensor used for performing automatic exposure control of radiation irradicated from a radiation generating apparatus, a notifying unit for performing threshold value reached notification to the radiation generating apparatus, if a dose value of the radiation incident on the pixel array reaches a threshold value, and a threshold value setting unit for setting the threshold value in second radiation imaging in which automatic exposure control of the radiation by the radiation detector is performed after first radiation imaging in which the automatic exposure control of the radiation by the AEC sensor is performed, based on pixel values related to the electric signals detected by the plurality of pixels in the first radiation imaging.

A correction image acquisition process includes: a first gain image acquisition process of reading a pixel signal from a pixel region irradiated with radiation in a state in which a subject is not placed to acquire a first gain image; a pre-irradiation image acquisition process of reading the pixel signal from the pixel region in a state in which the subject is not placed and the radiation is not emitted to acquire a pre-irradiation image; a discarding process of discarding charge accumulated in a pixel of the pixel region after a dose of radiation that saturates the charge is emitted in a state in which the subject is not placed; a post-irradiation image acquisition process of reading the pixel signal from the pixel region to acquire a post-irradiation image after the discarding process is performed; and a second gain image acquisition process of subtracting the pre-irradiation image from the post-irradiation image to acquire a second gain image.

A radiation imaging apparatus includes a pixel array including, in an imaging region where a plurality of pixels is arranged in a matrix, a detection pixel group in which a plurality of detection pixels is arranged in a row direction, and a control unit configured to control imaging. A grid having a stripe structure in which a radiation transmissive layer and a radiation absorption layer that are strip-shaped and extend in a first direction are alternately arranged in a second direction is disposed and can be used in the radiation imaging apparatus. The radiation imaging apparatus further includes a determination unit configured to determine whether a mode in which the imaging using signals from the detection pixel group is controlled is executable by the control unit, based on information about an angle between the row direction and the first direction.

A method and apparatus for diagnosing and/or calibrating underperforming pixels in detectors in a small pixelated photon counting CT system utilizes a series of tests on image data acquired in-situ as part of a series of calibration scans in the CT system. Tests are performed on the acquired data to determine the existence of underperforming pixels within the detectors such that the information acquired by those pixels can be replaced by alternate data from surrounding pixels (e.g. by interpolation). The underperforming pixels are stored in “bad” pixel tables and may be specific to a type of image (e.g., spectral or counting) and a specific protocol.

A method comprises: performing training and testing of an initial machine model to create a final machine model, wherein the training and testing use focal loss; performing detection of dead detector elements in a digital detector of a second digital radiographic (DR) imaging system using the final machine model; and determining whether to replace or keep the digital detector based on the detection. An apparatus comprises: a memory; and a processor coupled to the memory and configured to: perform training and testing of an initial machine model to create a final machine model, wherein the training and testing use focal loss; perform detection of dead detector elements in a digital detector of a second digital radiographic (DR) imaging system using the final machine model; and determine whether to replace or keep the digital detector based on the detection.

According to one embodiment, an X-ray diagnostic apparatus includes processing circuitry. The processing circuitry is configured to execute first calculation processing of calculating three-dimensional position information of each of an X-ray generator and an X-ray detector during rotation imaging, based on projection data acquired by executing the rotation imaging for a phantom with the X-ray generator and the X-ray detector arranged rotatably around the phantom.

Methods and devices for tracking an x-ray tube focal spot position are described. As successive images are captured by an image capturing system that includes the x-ray tube, the focal spot may change position. To track the change, one or more artificial targets may be arranged relative to the image capturing system such that an initial image is received that includes the artificial targets at a first position in the initial image. A gain map may be generated based on the initial image, and applied to a subsequent image received that also includes the artificial targets to generate a normalized subsequent image. A shift of the artificial targets from the first position in the initial image to a second position in the normalized subsequent image may be identified, where the shift corresponds to the focal spot's position change. Mathematical and/or physical adjustments may be made to correct for the change.

A near field communication system according to an embodiment includes: a long coupler provided for a first device; a short coupler provided for a second device and configured to perform wireless communication based on electromagnetic field coupling, with the long coupler; and signal processing circuitry configured to vary gain for each of various frequencies of a signal transmitted and received between the long coupler and the short coupler, in accordance with the position of the short coupler with respect to the long coupler.