X-RAY COMPUTER TOMOGRAPHIC APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide an X-ray computer tomographic apparatus capable of correcting fluctuations in energy spectra of X-rays emitted from an X-ray tube, and accurately reconstituting a tomographic image in every energy or every energy band.SOLUTION: An X-ray computer tomographic apparatus stores a plurality of reference count value data associated with each of a plurality of tube voltages or tube currents and indicating energy spectra of X-rays. Estimation means estimates tube voltage or tube current at the time of X-ray emission on the basis of comparison in energy spectra between second count value data and each of the plurality of reference count value data. Correction means corrects first count value data obtained together with the second count value data using the energy spectra obtained on the basis of the estimated tube voltage or tube current. A reconstitution unit reconstitutes medical image data on the basis of the corrected first count value data.