Patent ID: 9307949
Filing Date: 2016-04-12
CPC Classification: A61B,G01N,G06T

Claim Text:
1. An X-ray CT scanner comprising: a scanning section that scans an object to obtain X-ray transmission image data of the object from a plurality of projection directions, the scanning section comprising an X-ray source generating X-rays from an X-ray focus and an X-ray detector having X-ray detection elements in a two-dimensional array so as to detect the X-rays, wherein the X-ray source and the X-ray detector rotate around the object while facing each other and the object is interposed therebetween; an internal-distribution-estimating section that estimates an X-ray absorption coefficient distribution inside the object, based on the X-ray transmission image data scanned by the scanning section; a point-spread-function-estimating section that estimates a point spread function of a scatter derived from the object by performing a Monte Carlo simulation to simulate a physical interaction of the X-rays in a simulated object having the X-ray absorption coefficient distribution estimated by the internal-distribution-estimating section; a correction section that corrects the X-ray transmission image data by processing the point spread function estimated by the point-spread-function-estimating section and the X-ray transmission image date according to a deconvolution integral method; and an image-creating section that creates an image of the X-ray absorption coefficient distribution of the object by using the X-ray transmission image data corrected by the correction section.