Patent Document ID: 9585625
Application ID: 12676582
Patent Status: 1

Claim One:
1. A radiographic apparatus having a radiation emitting device for emitting radiation toward a patient, and a radiation detecting device for detecting radiation transmitted through the patient, to carry out radiation image pickup by obtaining radiographic images based on the detected radiation, the radiation emitting device being constructed to emit, as switched back and forth, radiation corresponding to a first voltage value and radiation corresponding to a second voltage value lower than the first voltage value, the radiation detecting device being constructed to detect alternately the radiation corresponding to the first voltage value and the radiation corresponding to the second voltage value, and to output alternately radiation detection signals corresponding to the first voltage value and radiation detection signals corresponding to the second voltage value, the apparatus comprising a high-voltage image acquiring device for acquiring high-voltage images based on the radiation detection signals corresponding to the first voltage value detected, a low-voltage image acquiring device for acquiring low-voltage images based on the radiation detection signals corresponding to the second voltage value detected, a composite image generating device for generating a composite high-voltage image for every time of the same first voltage as a frame in time between a plurality of frames to be composite, or generating a composite low-voltage image for every time of the same second voltage as a frame in time between a plurality of frames to be composite, and a subtraction processing device for carrying out a subtraction process concerning the high-voltage images and the low-voltage images in the frames same in time, thereby to acquire subtraction images.