X-RAY COMPUTER TOMOGRAPHY APPARATUS, IMAGE RECONSTRUCTION METHOD AND IMAGE RECONSTRUCTION PROGRAM

摘要

PROBLEM TO BE SOLVED: To improve image quality in a reconstructed image.SOLUTION: An X-ray tube 13 generates an X-ray. A photon counting detector 15 includes an X-ray detector 27 which detects an X-ray generated from the X-ray tube 13 and passing through a subject, and a data collection circuit 29 which collects a spectrum of the X-ray detected by the X-ray detector 27 for plural energy bands. A reconstruction circuit 53 calculates a modeling spectrum of each energy band on the basis of the known incident spectrum in scanning using the X-ray tube 13 and the photon counting detector 15 and plural initial values set in advance for plural parameters included in the response function of the photon counting detector 15. The reconstruction circuit 53 determines plural coefficients optimized for the response function on the basis of the comparison result between an output spectrum from the data collection circuit 29 and the modeling spectrum.SELECTED DRAWING: Figure 1