Patent ID: 8923482

Claim:
A radiation image detecting device comprising: (A) a detection panel having an imaging surface having a plurality of pixels arranged in two dimensions, for detecting a radiation image of an object from electric charge accumulated in said pixels in accordance with radiation emitted from a radiation source and passed through said object; (B) a plurality of dose measuring sensors disposed in said imaging surface; (C) an AEC section for performing automatic exposure control based on signals from said dose measuring sensors, said AEC section including: a measurement area setting circuit for setting a measurement area to be used for measuring a radiation dose on said imaging surface, said measurement area setting circuit being switchable between a specified area mode for performing an area selecting process to set up a first measurement area in a position predetermined in accordance with a body part to be imaged and an automatic area setting mode for performing an automatic area setting process to set up a second measurement area based on distribution of said radiation dose measured by said dose measuring sensors; a mode switching circuit for switching said measurement area setting circuit between said specified area mode and said automatic area setting mode; an integration circuit for integrating said signal from said dose measuring sensor present within said first or second measurement area, in order to obtain an integrated value corresponding to said radiation dose; and a comparison circuit for comparing said integrated value with a predetermined emission stop threshold value, wherein when said integrated value has reached said emission stop threshold value, the comparison circuit outputs an emission stop signal to stop radiation emission from said radiation source.