Patent ID: 7400707

Claim:
An apparatus for capturing a radiation image by emitting radiation from a radiation source and applying the radiation to a subject to capture a radiation image thereof, and for controlling said radiation source based on a radiation dosage applied to the subject, comprising: dose detecting means for detecting a dose of said radiation applied to said subject; radiation dosage calculating means for integrating the detected dose of said radiation with respect to time to calculate a radiation dosage applied to the subject; rate-of-change calculating means for calculating a rate of change of a time-integrated output signal from said radiation dosage calculating means before said radiation image is captured by applying said radiation to said subject; offset value calculating means for calculating an offset value of said radiation dosage from said rate of change; dosage correcting means for correcting said radiation dosage calculated by said radiation dosage calculating means based on said offset value; and radiation source control means for controlling said radiation source based on said radiation dosage corrected by said dosage correcting means.