Patent ID: 7295652

Claim:
An X-ray image diagnostic apparatus, characterized by comprising: an X-ray source that irradiates X-rays to a subject; an X-ray flat panel detector that is provided oppositely to the X-ray source and detects transmitted X-rays from the subject as an X-ray image; image processing means for applying image processing to the X-ray image detected by the X-ray flat panel detector; and image display means for displaying the X-ray image having undergone the image processing in the image processing means, wherein the image processing means includes: storage means for storing plural sets of residual image data that attenuate with time, acquired in advance from X-ray images in X-ray image acquisition modes from the X-ray flat panel detector before an actual measurement, in correspondence with the X-ray image acquisition modes; an image memory that stores one frame of the residual image data, which is obtained in a fluoroscopic mode after X-ray irradiation ends in a radiograph mode and before X-ray irradiation starts by switching to the fluoroscopic mode, from the X-ray flat panel detector; a computing unit that reads out quantities of attenuation of the first and subsequent frames of the residual image data in response to time on a basis of one frame of the residual image data stored in the image memory, and subtracts the read quantities of attenuation of the residual image data from a signal outputted from the X-ray flat panel detector; and a control portion that controls the image memory, an attenuation quantity storage portion, and the computing unit on a basis of respective signals, including control signals for each of the X-ray image acquisition modes including a radiographic signal and a fluoroscopic signal, and an image synchronizing signal to enable a display on the display means.