X-ray diagnostic apparatus utilizing x-ray shield member

Claim 1

An X-ray diagnostic apparatus (100) characterized by comprising: an X-ray source (30) for successively generating X - rays; means (22) for detecting an X-ray image of an object (34) under examination by projecting the X-rays from the X-ray source (30) toward the object (34), and for converting the detected image into X-ray transmission signals; an analogue-to-digital converter (23) for converting the X-ray transmission signals into corresponding digital transmission data; an X-ray shield member (50) having a plurality of X-ray shield materials (56), for partially blocking the penetration of the X-rays over an X-ray projection area (38) defined by projecting the X-ray from the X-ray source (30) to the X-ray detection means (22) through the object (34); first memory means (24) for storing at least first X-ray transmission data acquired during a first X-ray projection period under the condition that the X-ray shield member (50) is inserted into the X-ray projection area (38); first arithmetic operation means (26) for obtaining data representing an intensity distribution (Isc) of scattered X-ray components, based upon the first transmission data, over the entire X-ray projection area by way of an interpolation method; second memory means (25) for storing at least second transmission data acquired during a second X-ray projection period under the condition that the X-ray shield member (50) is removed from the X-ray projection area (38); and second arithmetic operation means (25) for subtracting said data representing the intensity distribution of scattered X-ray components from the second transmission data, thereby obtaining X-ray transmission data having no adverse influence by the scattered X-ray components.