Patent ID: 7313218

Claim:
A radiographic apparatus having radiation emitting means for emitting radiation toward an object under examination, radiation detecting means for detecting radiation transmitted through the object under examination, and signal sampling means for taking radiation detection signals from the radiation detecting means at predetermined sampling time intervals, for obtaining radiographic images based on the radiation detection signals outputted from the radiation detecting means at the predetermined sampling time intervals as radiation is emitted to the object under examination, said apparatus comprising: time lag removing means for removing lag-behind parts from the radiation detection signals by a recursive computation, on an assumption that a lag-behind part included in each of said radiation detection signals taken at the predetermined sampling time intervals is due to an impulse response formed of a plurality of exponential functions with different attenuation time constants; and impulse response determining means for determining an impulse response having a single exponential function from said impulse response formed of a plurality of exponential functions, based on a selected, single, fixed attenuation time constant having a single, fixed value for attenuating each of said radiation detection signals to a noise level in a radiation non-emission state following a radiation emission state; wherein said time lag removing means is arranged to obtain corrected radiation detection signals by using the impulse response determined by said impulse response determining means and having a single exponential function, and removing the lag-behind parts from the radiation detection signals.