The present invention relates to a photon counting detector and method. The detector (2) comprises a scintillator (10) configured to convert incident gamma radiation into optical photons, a pixelated photodetector (11) configured to detect the flux of optical photons, and circuitry (12). The circuitry is configured to determine, per photodetector pixel, a photon count by accumulating the number of optical photons detected by the respective photodetector pixel during an integration time period, compare, per photodetector pixel or group of photodetector pixels, a single photon count or multiple photon counts to a counting threshold, detect an event if, per photodetector pixel or group of photodetector pixels, the one or more photon counts exceed the counting threshold, and temporarily adapt the counting threshold for use in the comparison in one or more subsequent integration time periods based on the energy of the detected event.

The present invention relates to a photon counting detector and method. The detector comprises a scintillator (21) configured to convert incident gamma radiation into optical photons; a pixelated photodetector (20, 30) configured to detect the flux of optical photons wherein the pixelated photodetector is a silicon photomultiplier, SiPM, detector, wherein each photodetector pixel comprises an array of silicon avalanche photo diodes, SPADs; and circuitry (23, 90) configured to carry out, per photodetector pixel, the steps of controlling a stop timing at which one or more functions of the photodetector pixel are stopped; determining a first photon count by accumulating the number of optical photons detected by the SPADs of the respective photodetector pixel from the start of an integration period up to the stop timing; and estimating a second photon count based on the first photon count and the stop timing, the second photon count representing an estimate of the photon count for the total integration period.

A biased detector sub-module, a detector module, a detector, and a medical imaging device are provided. The biased detector sub-module includes a photoelectric conversion array, a biased analog-to-digital converter, and a substrate. The biased analog-to-digital converter is electrically connected to the photoelectric conversion array. The substrate includes a mounting substrate and a circuit connection substrate stacked in a Y direction. The circuit connection substrate is electrically connected to the biased analog-to-digital converter. The photoelectric conversion array and the biased analog-to-digital converter are sequentially disposed in the Z direction at a side of the mounting substrate facing away from the circuit connection substrate. The biased analog-to-digital converter is adjacent to an end portion of the mounting substrate overlapping with the circuit connection substrate. A part of the mounting substrate that is not overlapped with the circuit connection substrate is configured to be stacked on an adjacent biased detector sub-module.

The present invention relates to a photon counting detector and method. The detector (20) comprises a scintillator (21) configured to convert incident gamma radiation into optical photons, a pixelated photodetector (22) configured to detect the flux of optical photons, and circuitry (23). The circuitry (23) is configured to iteratively determine, per photodetector pixel, a photon count by accumulating the number of optical photons detected by the respective photodetector pixel during an integration time, assign the photon count, per photodetector pixel, to one of multiple energy bins by use of energy thresholds separating the multiple energy bins, and dynamically adapt, per photodetector pixel or group of photodetector pixels, the energy thresholds for use in a subsequent iteration based on information on the estimated photon count of said photodetector pixel or group of photodetector pixels in the subsequent iteration.

Systems and methods are herein provided for a radiation detector with rectangular pixels. In one example, an x-ray imaging system comprises a pixel array of a flat panel detector comprising a plurality of pixels with a rectangular pixel pitch arranged in pairs, wherein each of the plurality of pixels is configured to generate respective image data signals, wherein in low-dose applications, TFT control lines of pixels in each pixel pair are energized simultaneously to generate signals with an effective pixel pitch of twice the rectangular pixel pitch and in high-dose applications, TFT control lines of pixels in each pixel pair are energized sequentially and the detector is translated during image acquisition for an effective pixel pitch of half the rectangular pixel pitch.

Disclosed are an X-ray detection panel, an X-ray detector including the same, and a unit pixel for the same. The X-ray detection panel includes a plurality of unit pixels each including a photodiode, a first readout thin-film transistor, and a second readout thin-film transistor, wherein the first and second readout thin-film transistors are electrically connected to the photodiode and are connected in series to each other.

An X-ray imaging device includes a normally-off TFT, a gate line, a gate drive circuit including an output line, a switch connected between the gate line and the output line, and a control circuit. The control circuit operates the switch to switch from a state in which the gate line and the output line are connected to each other to a state in which the gate line and the output line are disconnected from each other in at least part of a period during which X-rays are not emitted from the X-ray source.

An X-ray detector includes a network chip, a power supply and a sensing circuit; the sensing circuit includes a power-supply managing chip, and the power-supply managing chip is electrically connected to the network chip and the power supply; the power supply is configured for supplying electric power to the network chip and the power-supply managing chip of the sensing circuit; the power-supply managing chip is configured for, when turned on, supplying electric power to the sensing circuit; the sensing circuit is configured for, when receiving a sleeping instruction sent by an external device or is not in an operating state, turning off the power-supply managing chip, to enter a sleeping state; and the network chip is configured for, when receiving an operation instruction sent by the external device, controlling the power-supply managing chip to be turned on, whereby the sensing circuit exits the sleeping state.

A neuromorphic radiography and computed tomography system including: a source of electromagnetic radiation; a scintillator, capable of fluorescing when struck by the electromagnetic radiation emitted by the source; and a neuromorphic camera comprising an array of pixels and having a field of view and configured to generate event data based on the fluorescence generated by the scintillator. The source emits the radiation in a field directed at an object and the object effects aspects of the electromagnetic radiation field, the scintillator receives the electromagnetic radiation and luminesces based on the electromagnetic radiation, the luminescence of the scintillator is captured by the neuromorphic camera to generate event data associated with luminescence events within the scintillator, wherein event data is generated each time an incidence of luminescence exceeds a threshold level of light within the field of view, and the event data is processed to generate a reconstruction of the object.

A single photon radiation detector is designed for a particular radiation source fluence, such that an incident radiation photon strikes a scintillator monolith, creating scintillation photons, which are amplified by appropriately sized channels of photomultipliers optically coupled to the scintillator monolith. The photomultiplier output is electronically shaped into a corresponding stream of scintillation pulses (otherwise referred to as scintillation photons) that pass through a comparator to produce a bitstream of the detected scintillation photons, which is sampled into a field programmable gate array (FPGA) acting as a giga-sample transceiver to produce time-to-digital conversions, capable of producing an output data stream of 10's-of-giga-samples per second or more. Appropriate design ensures sparsity of scintillation photon arrival, so that each photon in the bitstream corresponds to a single incident scintillation photon.