| CPC G01T 1/247 (2013.01) [H04N 5/32 (2013.01); H04N 25/75 (2023.01)] | 18 Claims |
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1. A radiographic apparatus comprising:
a plurality of pixel groups and a plurality of bias sources, wherein the pixel groups and the bias sources are arranged to correspond to each other on a one-to-one basis;
a driving circuit; and
a sensing unit,
wherein each of the plurality of pixel groups includes a pixel including a conversion element configured to convert radiation into a charge and a switch element configured to connect the conversion element to a signal line,
wherein each of the plurality of bias sources is configured to supply a bias potential to the conversion element of the pixel in the corresponding pixel group via at least one of a plurality of electrically independent bias lines,
wherein the driving circuit is configured to control the switch elements of the pixels, and
wherein the sensing unit is configured to sample a first signal value and a second signal value at timings overlapping at least in part, the first signal value indicating a current flowing through a first bias line among the plurality of bias lines, the first bias line being connected to a first pixel group including a pixel of which the switch element is turned on by the driving circuit among the plurality of pixel groups, the second signal value indicating a current flowing through a second bias line among the plurality of bias lines, the second bias line being connected to a second pixel group where the switch element is off among the plurality of pixel groups,
wherein the sensing unit is further configured to determine presence or absence of radiation irradiation based on the first signal value and the second signal value, and
wherein the first and second bias lines have substantially same time constants.
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