Radiation imaging apparatus and radiation imaging system

A radiation imaging apparatus comprising:

• a pixel array in which a plurality of pixels configured to detect radiation are arrayed to form a plurality of rows and a plurality of columns;
• a detection circuit configured to detect information representative of a radiation dose to the pixel array and output a detection signal corresponding to the information;
• and
• a control unit configured to detect radiation irradiation of the pixel array based on a plurality of integrated values obtained by integrating either the detection signal or a result of processing applied to the detection signal, in a plurality of integral intervals and to control the pixel array in accordance with the detection,
• wherein the control unit detects radiation irradiation of the pixel array based on comparison between a threshold value and the plurality of integrated values, and
• wherein a unique threshold value is assigned to each of the plurality of integral intervals.

A radiation imaging apparatus comprising:

• a pixel array in which a plurality of pixels configured to detect radiation are arrayed to form a plurality of rows and a plurality of columns;
• a detection circuit configured to detect information representative of a radiation dose to the pixel array and output a detection signal corresponding to the information;
• and
• a control unit configured to detect radiation irradiation of the pixel array based on a plurality of integrated values obtained by integrating either the detection signal or a result of processing applied to the detection signal, in a plurality of integral intervals and to control the pixel array in accordance with the detection,
• wherein the control unit detects radiation irradiation of the pixel array based on comparison between a threshold value and the plurality of integrated values, and
• wherein the control unit detects radiation irradiation of the pixel array when a predetermined number of integrated values including at least two of the plurality of integrated values exceed the corresponding threshold values.

A radiation imaging apparatus comprising:

• a pixel array in which a plurality of pixels configured to detect radiation are arrayed to form a plurality of rows and a plurality of columns;
• a detection circuit configured to detect information representative of a radiation dose to the pixel array and output a detection signal corresponding to the information;
• and
• a control unit configured to detect radiation irradiation of the pixel array based on a plurality of integrated values obtained by integrating either the detection signal or a result of processing applied to the detection signal, in a plurality of integral intervals and to control the pixel array in accordance with the detection,
• wherein the control unit detects radiation irradiation of the pixel array based on comparison between a threshold value and the plurality of integrated values, and
• wherein letting W be a length of one integral interval out of the plurality of integral intervals, and T be the threshold value assigned to the one integral interval, the length of another integral interval out of the plurality of integral intervals is k×W (k is a real number larger than 1), and the threshold value assigned to the other integral interval is T×√k.

A radiation imaging apparatus comprising:

• a pixel array in which a plurality of pixels configured to detect radiation are arrayed to form a plurality of rows and a plurality of columns;
• a detection circuit configured to detect information representative of a radiation dose to the pixel array and output a detection signal corresponding to the information;
• and
• a control unit configured to detect radiation irradiation of the pixel array based on a plurality of integrated values obtained by integrating either the detection signal or a result of processing applied to the detection signal, in a plurality of integral intervals and to control the pixel array in accordance with the detection,
• wherein letting W be the length of an mth integral interval (m is a natural number), the length of an (m+1)th integral interval is k×W (k is a real number larger than 1).

A radiation imaging system comprising:

• a pixel array in which a plurality of pixels configured to detect radiation are arrayed to form a plurality of rows and a plurality of columns;
• a detection circuit configured to detect information representative of a radiation dose to the pixel array and output a detection signal corresponding to the information;
• a control unit configured to perform radiation detection processing until radiation irradiation of the pixel array is detected and to control the pixel array in accordance with the detection, wherein in the radiation detection processing, the control unit integrates either the detection signal or a result of processing applied to the detection signal, in a plurality of integral intervals which are different from each other, and detects the radiation irradiation of the pixel array based on comparison between a threshold value and an integrated value obtained by the integration;
• and
• a processor configured to process a signal output from the radiation imaging apparatus.

A radiation imaging apparatus comprising:

• a pixel array in which a plurality of pixels configured to detect radiation are arrayed to form a plurality of rows and a plurality of columns;
• a detection circuit configured to output a detection signal representative of a radiation dose to the pixel array;
• and
• a control unit configured to perform radiation detection processing until radiation irradiation of the pixel array is detected, wherein in the radiation detection processing, the control unit repeatedly performs, during a period, based on an integrated value provided by integrating either the detection signal or a result of processing applied to the detection signal, determining whether the pixel array is irradiated with the radiation without resetting the integration.
• wherein the control unit resets the integration and continues the radiation detection processing for a next period in a case that the radiation irradiation of the pixel array is not detected in the period, and the control unit terminates the radiation detection processing in a case that the radiation irradiation of the pixel array is detected in the period, and the control unit controls the pixel array in accordance with the detection.

A radiation imaging system comprising:

• a pixel array in which a plurality of pixels configured to detect radiation are arrayed to form a plurality of rows and a plurality of columns;
• a detection circuit configured to output a detection signal representative of a radiation dose to the pixel array;
• a control unit configured to perform radiation detection processing until radiation irradiation of the pixel array is detected, wherein in the radiation detection processing, the control unit repeatedly performs, during a period, based on an integrated value provided by integrating either the detection signal or a result of processing applied to the detection signal, determining whether the pixel array is irradiated with the radiation without resetting the integration.
• wherein the control unit resets the integration and continues the radiation detection processing for a next period in a case that the radiation irradiation of the pixel array is not detected in the period, and the control unit terminates the radiation detection processing in a case that the radiation irradiation of the pixel array is detected in the period, and the control unit controls the pixel array in accordance with the detection;
• and
• a processor configured to process a signal output from the radiation imaging apparatus.