After converting to the curvilinear integral of x-ray line attenuation

摘要

PROBLEM TO BE SOLVED: To solve the problem that when merely obtaining an image by using only energy of a small range close to monochrome, influence of beam hardening can be removed but count is reduced in a narrow window and a statistics error is increased and the removal cannot be attained by a present X-ray tube performance and data of each window has to be added (averaged) in some form, and that even when performing weighed averaging at the time of counting, remarkable control of the beam hardening is followed by side reaction of raising a weighing function of only a narrow energy portion, that is, increasing the influence of statistics noise.;SOLUTION: An image reconstruction method for an X-ray CT device subjects a count measured values obtained in a plurality of energy windows to transformation to the line integral of an X-ray linear attenuation coefficient and thereafter to weighed averaging.;COPYRIGHT: (C)2010,JPO&INPIT