Patent ID: 7003071

Claim:
An X-ray CT apparatus comprising: an X-ray source for applying X-rays to an object; an X-ray detector arranged to face the X-ray source for detecting the amount of transmitted X-rays of the object as projection data; basic-data acquisition means for acquiring response data of the projection data as basic data with no object in advance every time the image of the object is acquired; analyzing means for analyzing an afterglow component of the acquired basic data into a plurality of time constants and component ratios of the afterglow component corresponding to the time constants; storage means for storing the analyzed time constants and component ratios; correcting means for extracting an afterglow component of the projection data on the basis of the stored time constants and components ratios during radiography of the object and removing the extracted afterglow component of the projection data from the projection data to produce corrected projection data; reconstructing means for reconstructing an image using the produced corrected projection data; and display means for displaying the reconstructed image.