RADIATION IMAGING SYSTEM AND OPERATING METHOD THEREOF, AND RADIATION IMAGE DETECTING DEVICE

摘要

A measurement area selection circuit has an irradiation field determination unit, an object area determination unit, and a measurement area determination unit. The irradiation field determination unit determines an irradiation field of an imaging surface of an FPD. The object area determination unit determines an object area from a comparison result between a first expected received dose of a directly exposed area and dose detection signals of detection pixels situated in the irradiation field. The measurement area determination unit determines a measurement area, which corresponds to a region of interest, from a comparison result between a second expected received dose of the measurement area and the dose detection signals of the detection pixels situated in the irradiation area and the object area. The dose detection signals of the detection pixels situated in the measurement area are used for AEC.

主权项

1. A radiation imaging system including a radiation source for emitting radiation to an object, and a radiation image detecting device having a detection panel formed with an imaging surface for imaging a radiographic image of said object, said imaging surface having an array of a plurality of pixels each for accumulating electric charge in accordance with a received dose of said radiation emitted from said radiation source, said radiation imaging system comprising:
a plurality of dose detection sensors disposed in said imaging surface, for detecting said received dose; an expected received dose obtainment unit for obtaining an expected received dose that is expected to be applied to a part of said imaging surface; an area determination unit for determining a measurement area out of said imaging surface based on a comparison result between said expected received dose and said received dose detected by said dose detection sensor, said measurement area being used in performing automatic exposure control that makes said radiation source stop emitting said radiation to control exposure of said radiographic image; and an automatic exposure control unit for performing said automatic exposure control based on a comparison result between an integrated value of said received dose detected by said dose detection sensor situated in said measurement area and a predetermined emission stop threshold value.