A circuit (300) for detecting the appearance of x-rays with a view to triggering a radiological image capture, comprising a set (301) of photodiodes that is connected to a ground (G.sub.D), an amplifying circuit (302) and a capacitor (C2), the amplifying circuit (302) comprising an amplifier (AMP) and a voltage source (GEN) and being connected, via a first input, to the output of the set (301) of photodiodes, the capacitor (C2) being connected between the ground (G.sub.D) and a second input of the amplifier (AMP), the detecting circuit (300) being characterized in that the amplifying circuit (302) is configured to carry out in succession the steps of: Charging the capacitor (C2) with a reference voltage (V.sub.ref) generated by the voltage source (GEN); Isolating the second input of the amplifier (AMP) from the voltage source (GEN); and Integrating the current generated by the set (301) of photodiodes.

A radiation imaging apparatus is provided. The apparatus comprises pixels configured to detect radiation with a first sensitivity and a second sensitivity lower than the first sensitivity. Each of the pixels starts an operation for accumulating a signal with the first sensitivity in accordance with a start of irradiation of the radiation imaging apparatus with radiation, samples an accumulated signal as a first signal after lapse of a first time shorter than a period of irradiation with radiation since a start of an operation for accumulating a signal, switches to the second sensitivity, and accumulates a signal, samples an accumulated signal as a second signal in accordance with an end of irradiation of the radiation imaging apparatus with radiation, and outputs the first signal and the second signal to generate a radiation image based on the first signal and the second signal.

Provided is an X-ray imaging panel in which off-leakage current can be decreased, and a method for producing the same. An imaging panel includes a photodiode that includes a lower electrode, a photoelectric conversion layer 15 provided on the lower electrode, and an upper electrode 14b provided on the photoelectric conversion layer 15. The photoelectric conversion layer 15 includes a first amorphous semiconductor layer 151, an intrinsic amorphous semiconductor layer 152, and a second amorphous semiconductor layer 153. In the photoelectric conversion layer 15, an upper end portion 1531 of the second amorphous semiconductor layer 153 has a protrusion portion 15a that protrudes toward an outer side of the photoelectric conversion layer 15 with respect to an upper end portion 1521 of the intrinsic amorphous semiconductor layer 152.

Embodiments of the present disclosure provide a pixel circuit and a drive method thereof, and a detector including the pixel circuit. The pixel circuit includes a photoelectric conversion circuit, a reset circuit, an amplifying circuit, a first control circuit, a second control circuit, a storage circuit, and an output circuit. The photoelectric conversion circuit is configured to convert an optical signal into an electric signal. The reset circuit is configured to reset a voltage of the first node. The amplifying circuit is configured to amplify the voltage of the first node. The first control circuit is configured to control a voltage of the second node. The second control circuit is configured to control a voltage of the third node. The storage circuit is configured to store an electric charge corresponding to the voltage outputted from the amplifying circuit. The output circuit is configured to output the stored electric charge.

Some embodiments include a method, comprising: integrating an input signal using an integrator to generate an integrated signal; comparing the integrated signal to a threshold; and injecting an offset signal into the integrator in response to comparing the integrated signal to the threshold such that the integrated signal passes the threshold.

A radiation image apparatus without synchronous communication includes a pixel circuit, a reading circuit, a drive control circuit, an image processing circuit, a time measuring circuit, and a management circuit. The pixel circuit includes an imaging element configured to generate image data based on radiation and a detecting element configured to generate irradiation data of irradiation with the radiation. The reading circuit is configured to read the image data and the irradiation data. The drive control circuit is configured to control a first time when the image data is read by the reading circuit. The image processing circuit is configured to perform correction of the read image data. The time measuring circuit is configured to measure a second time related to the irradiation with the radiation based on the irradiation data. The management circuit is configured to manage the correction based on the first time and the second time.

A radiation image apparatus without synchronous communication includes a pixel circuit, a reading circuit, a drive control circuit, an image processing circuit, a time measuring circuit, and a management circuit. The pixel circuit includes an imaging element configured to generate image data based on radiation and a detecting element configured to generate irradiation data of irradiation with the radiation. The reading circuit is configured to read the image data and the irradiation data. The drive control circuit is configured to control a first time when the image data is read by the reading circuit. The image processing circuit is configured to perform correction of the read image data. The time measuring circuit is configured to measure a second time related to the irradiation with the radiation based on the irradiation data. The management circuit is configured to manage the correction based on the first time and the second time.

A three dimensional integrated edgeless pixel detector apparatus can be implemented, which includes a multi-tiered three-dimensional detector having one sensor layer, and two ASIC layers comprising an analog tier and a digital tier configured for x-ray photon time of arrival measurement and imaging. In a preferred embodiment, a hit processor can be implemented in association with a priority encoder and a configuration register and output serializer with mode selection.

A radiographic image capturing system includes the following. A radiographic image capturing apparatus includes a two-dimensional array of radiation detecting elements and a control circuit which controls reading of image data from each of the radiation detecting elements based on a predetermined capturing sequence. An image processor has first gain data to correct gains of the radiation detecting elements, and generates a radiographic image based on the corrected image data. The control circuit of the radiographic image capturing apparatus is capable of varying at least one of a reverse bias voltage and a signal line voltage to be applied to the corresponding signal line. The control circuit reads a signal value from each of the radiation detecting elements, creates second gain data based on the read signal value, and corrects the radiographic image with the first gain data and the second gain data.

An X-ray image pickup system (10) includes an X-ray source (16), an image pickup panel (12), a scintillator (13), and an X-ray control unit (14E). The image pickup panel includes a photoelectric conversion element (26), a capacitor (50), a thin film transistor (24), and TFT control units (14A, 14B, 14F). To the photoelectric conversion element (26), scintillation light is projected. The capacitor (50) is connected to the photoelectric conversion element (26), and accumulates charges. The thin film transistor (24) is connected to the capacitor (50). The TFT control units (14A, 14B, 14F) control an operation of the thin film transistor (24). The thin film transistor (24) includes a semiconductor active layer (32) made of an oxide semiconductor. The X-ray control unit (14E) intermittently projects X-ray to the X-ray source (16). The TFT control units (14A, 14B, 14F) cause the thin film transistor (24) to operate when the X-ray is not projected, so as to read out the charges accumulated in the capacitor (50).