Patent ID: 7039151

Claim:
An X-ray Computed Tomography device comprising: an X-ray source which irradiates a subject with X-rays; a two-dimensional detector in which a plurality of detection elements for detecting X-rays from said X-ray source are two-dimensionally arranged; a rotation unit configured to relatively rotate said X-ray source and said two-dimensional detector around the subject; a grid which is placed in front of said two-dimensional detector to remove scattered radiation of the X-rays, said grid being detachable; a correction unit configured to perform computation with respect to a subject image obtained by said two-dimensional detector by using the subject image and a gain image obtained by said two-dimensional detector; an image processing unit configured to execute a grid pattern removal processing on the subject image corrected by said correction means; and a reconstruction unit configured to reconstruct an image on the basis of the subject image obtained by said image processing unit, wherein said grid forms stripes using a plurality of grid plates, and each of the plurality of grid plates is placed substantially parallel to a plane of rotation of said X-ray source, and the gain image is obtained while said grid is detached.