Patent ID: 7039156

Claim:
A display method of an X-ray projection image for medical use which is obtained by rotating a direction in which the X-ray projection image is to be projected based on three dimensional X-ray absorption coefficient data previously produced by an X-ray CT, the X-ray CT being carried out by turning an X-ray generator and an X-ray detector, facing each other, around an object to be examined, said method comprising the steps of: a) displaying an image layer of said object with a predetermined thickness extending perpendicular to a radiation plane defined by rotational irradiation of an X-ray beam for said X-ray Ct; b) setting a projection interested area to construct the X-ray projection image of said object on said image layer, said projection interested area being comprised of said three dimensional X-ray absorption coefficient data; c) producing the X-ray projection image with respect to a projection plane intersecting said radiation plane by projecting said three dimensional X-ray absorption coefficient data existing in said projection interested area by further setting said projection plane on said image layer; and d) displaying thus obtained X-ray projection image for medical use.