Abstract: To provide a radiation imaging apparatus and a radiation imaging system that can detect radiation with high accuracy, the radiation imaging apparatus includes: a detection unit in which conversion elements that convert radiation into an electric signal are arranged in a matrix shape; a radiation detection unit configured to detect an irradiation state of radiation; a drive circuit configured to drive the detection unit in accordance with the irradiation state detected by the radiation detection unit; and a radiographing kind setting unit configured to set a radiographing kind, wherein the radiation detection unit changes a radiation detection capability in accordance with the radiographing kind set by the radiographing kind setting unit.

Abstract: A radiation imaging system capable of obtaining excellent image quality is provided.

Abstract: A radiation image pickup apparatus includes a pixel array having pixels each including a conversion element and a switch element, a drive circuit for controlling the switch element between a conducting state and a non-conducting state, a detection unit for outputting a detection signal varying with the intensity of irradiation of the pixel array, and an arithmetic unit for calculating a start threshold value used to detect start of irradiation based on the signal output from the detection unit during a period when radiation is not emitted onto the pixel array in which the switch elements are sequentially set in a conducting state on a row-by-row basis by the drive circuit and the signal output from the detection unit during a period when radiation is emitted onto the pixel array in which the switch elements are sequentially set in a conducting state on a row-by-row basis by the drive circuit.

Abstract: An image pickup apparatus includes a pixel array including a plurality of pixels arranged in a two-dimensional pattern, each of which includes a conversion unit, an amplification unit, a first holding unit configured to hold a first signal obtained by the amplification unit amplifying an electric charge converted by the conversion unit having a first sensitivity, a second holding unit configured to hold a second signal obtained by the amplification unit amplifying the electric charge converted by the conversion unit having a second sensitivity different from the first sensitivity, and a third holding unit configured to hold an offset signal of the amplification unit, and a correction unit configured to correct the first signal using a second output signal output from the second holding unit or a first output signal output from the first holding unit, and a third output signal output from the third holding unit.

Abstract: A radiation imaging apparatus includes a pixel array where a plurality of pixels configured to detect radiation are arrayed, a sensor configured to detect radiation irradiation for exposure control, a reader configured to read out signals from the plurality of pixels and the sensor, and a processor configured to process the signals read out by the reader. The processor corrects, based on the signals read out from the sensor by the reader, the signals read out from the plurality of pixels by the reader.

Abstract: An image pickup apparatus includes a detector and an image processing unit. The detector executes image pickup operations in which electrical signals based on radiation are output and executes, in a period between a first image pickup operation and a second image pickup operation, a first inter-image pickup operation for suppressing a lag generated by the first image pickup operation and a second inter-image pickup operation for obtaining dark signals from the detector after the first inter-image pickup operation. The signal processing unit calculates a correction coefficient using a first time ts, a second time te, and the dark signals, predicts an amount of offset to be included in electrical signals of the second image pickup operation using a third time ts?, a fourth time te?, and the correction coefficient, and executes calculation using the electrical signals and the amount of offset output from the detector in the second image pickup operation.

Abstract: A radiation image pickup system includes a correction coefficient calculation unit that calculates a correction coefficient using pixel output values of a plurality of pixels, and a correction unit that corrects pixel output values of a plurality of pixels using the correction coefficient. A drive control unit repeatedly resets an electric charge caused by a dark current of a plurality of pixels until a detection unit detects a start of radiation exposure. The reset operation is performed simultaneously for n rows that are not adjacent to each other, where n is an integer equal to or greater than 2. The correction coefficient calculation unit calculates the correction coefficient using pixel output values of pixels in a row subjected to the reset operation in a period from a start of radiation exposure to a start detection time and pixel output values of pixels in an adjacent row.

Abstract: Provided is a radiation imaging apparatus, including: a first conversion element arranged to convert a radiation ray into electric charge in order to obtain a radiographic image; a first amplifier arranged to output a voltage corresponding to the electric charge of the first conversion element; a second conversion element arranged to convert the radiation ray into electric charge in order to detect radiation irradiation; a second amplifier arranged to output a voltage corresponding to the electric charge of the second conversion element; and a control circuit configured to control the first amplifier and the second amplifier, in which the control circuit is capable of controlling the second amplifier independently of control that is exerted over the first amplifier.

Abstract: A radiation image capturing apparatus, comprising a sensor configured to monitor an irradiating dose of radiation, a switch configured output a sensor signal from the sensor, a readout unit configured to read out the sensor signal via a signal line, and a controlling unit, wherein the controlling unit performs first control of repeatedly performing, while the sensor is irradiated, a series of operations including a first operation of setting the switch to a conductive state and a second operation of setting the switch to a non-conductive state, second control of reading out the sensor signal in the first operation as a first signal and a potential of the signal line in the second operation as a second signal, and third control of calculating the irradiating dose of radiation based on the first signal and the second signal.

Abstract: A radiation imaging apparatus including: a detector that includes a detection section in which pixels having a conversion element that converts radiation to an electric charge are arranged in a matrix shape, a drive circuit configured to drive the detection section, and a read circuit configured to output an electric signal that corresponds to the electric charge as image data; a radiation detection unit configured to detect a radiation irradiation state using two detection units that are adjacently arranged in the detection section; and a control unit configured to control operations of the drive circuit and the read circuit in accordance with a detection result obtained by the radiation detection unit, wherein a detection capability by one of the detection units is set to a lower capability than a detection capability at by the other of the detection units.

Abstract: A radiation image pickup apparatus capable of setting an optimum threshold value used for instantaneously and highly accurately detecting the presence/absence of irradiation includes a pixel array having a plurality of pixels arranged in a matrix, where each of the pixels includes a conversion element and a switch element, a drive circuit for supplying a drive signal for controlling the switch element between a conducting state and a non-conducting state, a detection unit for outputting a detection signal varying with the intensity of irradiation of the pixel array, and an arithmetic unit for calculating an end threshold value used to detect end of irradiation on the basis of the signal output from the detection unit during a period of time during which irradiation is applied to the pixel array in which the switch elements of the pixels are set in a non-conducting state by the drive circuit.

Abstract: A radiation imaging apparatus including pixels; driving lines; a driving circuit; bias lines; an acquisition unit configured to acquire an evaluation value based on a current flowing in the bias line; a determination unit configured to compare the evaluation value with a comparison target value to determine whether radiation is irradiated; a control unit configured to control the acquisition unit and the determination unit; and a storage unit configured to store the evaluation value used in the determination process, is provided. A comparison target value used in a given determination process is based on one or more evaluation values used in one or more determination processes which are performed before the given determination process and in which it is determined that radiation has not been irradiated.

Abstract: A radiographic image capturing apparatus, comprising a plurality of sensors arrayed on a substrate, a driving unit, a detection unit and a control unit, wherein the control unit is configured to perform a first control controlling the driving unit so as to repeatedly initialize the plurality of sensors on a row-by-row basis before a start of emission of radiation, and a second control controlling the driving unit so as to interrupt the initialization in response to a detection signal from the detection unit and cause the plurality of sensors to output signals, and the apparatus further comprises a determination unit configured to determine whether or not the detection signal is a signal which was output in response to the start of emission of radiation.

Abstract: A radiation imaging apparatus comprising a plurality of sensors arrayed to form a plurality of rows and a plurality of columns on a substrate and a driving unit configured to drive the plurality of sensors row by row, wherein the driving unit performs a first operation of driving the plurality of sensors while selecting the plurality of rows in a first order, and a second operation of driving the plurality of sensors while selecting the plurality of rows in a second order different from the first order after the first operation, such that a time difference is produced between a sensor in each row and a sensor in a neighboring row from the selection in the first order to the selection in the second order.

Abstract: An imaging apparatus includes a pixel that generates charge; an integral amplifier that integrates charge transferred from the pixel; a low pass filter to which output of the integral amplifier is supplied and whose time constant is variable; first and second sample-and-hold circuits that sample and hold output of the low pass filter before and after the charge is transferred from the pixel to the integral amplifier, respectively; a differential circuit that outputs a difference between signals held by the first and second sample-and-hold circuits; and a control circuit that changes the time constant. The control circuit decreases the time constant after the sampling by the first sample-and-hold circuit ends, and increases the time constant in the middle of the sampling by the second sample-and-hold circuit.

Abstract: A radiation imaging apparatus, comprising a sensor array in which a plurality of sensors configured to output signals corresponding to irradiated radiation, a detection unit configured to detect radiation, a driving unit configured to drive the sensor array, so as to initialize the plurality of sensors for each row repeatedly at least until the detection unit detects irradiation of radiation and to read out signals from the plurality of sensors for each row sequentially, and a processing unit configured to process signals from the sensor array, so as to correct a signal from the sensor on a row, of the plurality of sensors, which has been initialized during the irradiation of radiation, based on a timing of the initialization.

Abstract: An image-pickup apparatus including a detector comprising a detecting unit and a reading circuit, the detecting unit including pixels, each of which including a conversion element, the reading circuit which includes a connecting unit that is electrically connected to a signal wire transferring an electric signal and that electrically connects the signal wire to a node, and which performs a reading operation to output the electric signal from the pixel. A control unit controls an operation of the reading circuit, and a sensing unit senses the end of radiation irradiation based on an output of the reading circuit, which is acquired during the period of an accumulation operation of the detector. The control unit starts establishing the electrical connection between the signal wire and the node through the connecting unit based on the sensed irradiation end, and retains the electrical connection until the start of the reading operation.

Abstract: A radiation imaging apparatus comprises a conversion element and a transistor. A drive unit performs a reset operation at a plurality of times, by supplying a conducting voltage to gates of the transistors, successively, one row by one row, an operation of stopping the supplying of the conducting voltage responsive to detecting the irradiation of the radiation to perform an accumulation operation and, after the reset operation, a read out operation. During the reset operation, a period between the supplying the conducting voltage to the gates of the transistors in one row and the supplying the conducting voltage subsequently to the gates of the transistors in another row is different from a period between the supplying the conducting voltage to the gates of the transistors in the another row and the supplying the conducting voltage subsequently to the gates of the transistors in further another row.

Abstract: A radiation imaging apparatus, comprising an imaging unit in which a plurality of pixels are arranged to form a plurality of rows and a plurality of columns, and a control unit configured to control the imaging unit so as to perform reset operation for initializing each of the plurality of pixels repeatedly, and readout operation, after the reset operation, for reading out a signal from each of the plurality of pixels sequentially, wherein one cycle length of the reset operation is shorter than a period of time required for the readout operation, and a pulse width of a signal supplied to each of the plurality of pixels in the reset operation is shorter than a pulse width of a signal supplied to each of the plurality of pixels in the readout operation.

Abstract: A radiation imaging apparatus, comprising a sensor array configured to output a signal in accordance with irradiated radiation, a driving unit configured to output a signal from the sensor array by driving the sensor array, a detecting unit configured to detect irradiated radiation, a control unit configured to control the driving unit to perform first readout to read out a signal corresponding to charge accumulated in the sensor array from the sensor array and perform second readout to further read out a signal from the sensor array at least in a case where the first readout has started during irradiation of radiation, and a processing unit configured to correct the signal obtained by the first readout based on the signal obtained by the second readout.