Patent ID: 6289074
Filing Date: 2001-09-11
Classification: A61B

Abstract:
An X-ray computed tomography method of the local region of the object in which X-rays are radiated locally on part of the object, by turning a rotary arm with an X-ray generator and a two-dimensional image sensor faced to each other, the method comprising:producing an X-ray projection image of a local region on the two-dimensional X-ray image sensor by turning the rotary arm within a scope of angle according to projection conditions, while locally radiating conical X-ray beams from the X-ray generator covering only the local region of the object, with a rotating center of the rotary arm fixed at a center position of the local region, the local region being a part of the object to be examined, andarithmetically processing the X-ray projection image thus produced and extracting a three-dimensional X-ray absorption coefficient distribution information on the local region and thereby producing a sectional image of the local region of the object to be examined.