An edge-on photon-counting detector includes at least one detector module having a respective edge facing incident X-rays. The at least one detector module includes a semiconductor substrate. The edge-on photon-counting detector also includes a plurality of active integrated pixels arranged in the semiconductor substrate.

The present disclosure concerns a charge-accumulation radiation detector that includes a semiconductor device and specifies an incident time and energy of radiation from a transferred image signal. The radiation detector includes a semiconductor substrate and electrodes disposed on both sides of the semiconductor substrate, and includes a plurality of charge accumulation units inside the semiconductor substrate. The plurality of charge accumulation units is each configured to accumulate charges generated by radiation incident on the semiconductor substrate. The charges accumulated in the charge accumulation units are readable to outside through at least one of the electrodes.

An image sensor comprises a plurality of pixels, each pixel including: a light-receiving element that outputs an output voltage that varies in response to a photon entering; at least one comparator that compares the output voltage with a plurality of mutually-different threshold voltages and outputs a single signal each time the output voltage varies so as to exceed either of the threshold voltages; and at least one counter that counts a number of signals output by the comparator upon comparing the output voltage with the plurality of threshold voltages and outputs a count value, for each of the threshold voltages.

An exposure record totalizer includes: a hardware processor that adds up a first exposure record of a first exposure image and a second exposure record of a second exposure image, when a radiography system generates the first exposure image through first exposure and the second exposure image through second exposure, and that links information about a third exposure record to a third exposure image generated on the basis of the first exposure image and the second exposure image, the third exposure record being generated by the hardware processor.

Disclosed herein is an apparatus comprising: a radiation absorption layer comprising an electrode; a counter; a controller configured to cause a number registered by the counter to change, in response to an absolute value of an electrical signal on the electrode equaling or exceeding an absolute value of a second threshold during a time delay that is started from a time at which the absolute value of the electrical signal equals or exceeds an absolute value of a first threshold.

An apparatus suitable for detecting X-ray is disclosed. In one example, the apparatus comprises an X-ray absorption layer and a controller. The X-ray absorption layer comprises a first pixel and a second pixel. The controller is configured for determining whether all carriers generated in the X-ray absorption layer by an X-ray photon are collected by the first pixel and the second pixel, and determining the energy of the X-ray photon based on a sum of a first portion of the carriers that is collected by the first pixel and a second portion of the carriers that is collected by the second pixel.

The invention relates to a detection values determination system, especially for photon-counting CT scanners, comprising a detection pulse providing unit for providing detection pulses for an array of detection pixels 17, which is provided with an anti-charge-sharing grid 15 for suppressing charge sharing between different clusters 14 of the detection pixels, wherein the detection pulses are indicative of the energy of photons incident on the detection pixels. Charge-sharing-corrected detection values are determined based on the provided detection pulses, wherein for determining a charge-sharing-corrected detection value for a detection pixel of a cluster only detection pixels of the same cluster are considered. This allows for a relatively high detective quantum efficiency, wherein the technical efforts for providing the charge sharing correction can be relatively low.

An image signal processing system (ISP) comprising an input interface (IN) for receiving photon counting projection data acquired by an X-ray imaging apparatus (IA) having a photon counting detector (D). A calibration data memory (CMEM) of the system holds calibration data. The calibration data encodes photon counting data versus path lengths curves for different energy thresholds of i) said detector (D) or ii) of a different detector. At least one of said curves is not one-to-one. A path length convertor (PLC) of the system converts an entry in said photon counting projection data into an associated path length based on said calibration data.

Disclosed herein is a radiation detector, comprising: a radiation absorption layer comprising an electrode; a voltage comparator that compares a voltage of the electrode to a first threshold; a counter that registers a number of photons of radiation absorbed by the radiation absorption layer; a controller; and a voltmeter. The controller is configured to start a time delay from a time at which the voltage comparator determines that an absolute value of the voltage equals or exceeds an absolute value of the first threshold. The controller is configured to cause the voltmeter to measure the voltage upon expiration of the time delay. The controller is configured to determine the number of photons by dividing the voltage measured by the voltmeter by a voltage that a single photon would have caused on the electrode. The controller can cause the number registered by the counter to increase by the number of photons.

A radiographic image capturing apparatus includes: a radiation detector in which a plurality of pixels for accumulating electric charges corresponding to emitted radiation are arranged in a two-dimensional manner; a control unit that controls the radiation detector; a radiation emission unit that emits radiation; a changing unit that integrally changes angles of the radiation detector and the control unit with respect to a predetermined direction; a heat sink in which a guiding unit for guiding an air flow in a predetermined guiding direction is provided and which dissipates heat of the control unit; and a housing unit in which the radiation detector, the control unit, and the heat sink are housed and which has a radiation detection surface irradiated with the radiation emitted from the radiation emission unit.