Patent ID: 7787590

Claim:
A radiographic apparatus for obtaining radiographic images based on radiation detection signals, comprising a radiation emitting device for emitting radiation toward an object under examination; a radiation detecting device for detecting radiation transmitted through the object; (1) a non-irradiation signal acquiring device for acquiring a plurality of radiation detection signals detected from the radiation detecting device in time of non-irradiation before irradiation of the radiation in an imaging event; (2) an irradiation signal acquiring device for acquiring the radiation detection signals detected from the radiation detecting device in time of irradiation of the radiation in the imaging event; (3) a lag correcting device operable, when irradiation is carried out twice across a non-irradiation, the earlier irradiation being regarded as a first irradiation and the later irradiation being regarded as a second irradiation, radiation detection signals acquired by said irradiation signal acquiring device during said first irradiation being regarded as first radiation detection signals, and radiation detection signals acquired by said irradiation signal acquiring device during said second irradiation being regarded as second radiation detection signals, for applying lag data based on a plurality of radiation detection signals acquired by the non-irradiation signal acquiring device in time of non-irradiation before the first irradiation to both said first radiation detection signals and said second radiation detection signals, to remove lag-behind parts included in the radiation detection signals from the radiation detection signals, thereby performing a lag correction of the lag-behind parts; and (4) a radiographic image acquiring device for acquiring radiographic images by performing subtraction using the first radiation detection signals and the second radiation detection signals for which the lag correction has been carried out by the lag correcting device.