X-ray computed tomography imaging apparatus and photon counting CT apparatus

摘要

Based on a plurality of detection data sets acquired by a data acquisition unit and correspond to respective tube voltages, an image generator generates a plurality of reference substance image data sets targeting respective reference substances contained in a subject. The image generator generates a correction data set for each of the plurality of tube voltages by applying, to a detection data set corresponding to each of the tube voltages, a correction coefficient for suppressing a discrepancy of an actual energy spectrum of the X-rays detected by an X-ray detector from a predetermined X-ray energy spectrum, and generates the plurality of reference substance image data sets based on a plurality of correction data sets corresponding to the respective tube voltages.

主权项

1. An X-ray computed tomography imaging apparatus comprising:
an X-ray tube configured to generate X-rays; a high-voltage generator configured to generate a tube voltage to be applied to the X-ray tube; an X-ray detector configured to detect X-rays which have been generated from the X-ray tube and have passed through a subject; a support mechanism configured to rotatably support the X-ray tube; a data acquisition unit configured to acquire detection data corresponding to an intensity of the detected X-rays via the X-ray detector; and an image generator configured to generate, based on a plurality of detection data sets which have been acquired by the data acquisition unit and correspond to respective tube voltages, a plurality of reference substance image data sets targeting respective reference substances contained in the subject, wherein the image generator generates a correction data set for each of the plurality of tube voltages by applying, to a detection data set corresponding to each of the tube voltages, a correction coefficient for suppressing a discrepancy of an actual energy spectrum of the X-rays detected by the X-ray detector from a predetermined X-ray energy spectrum, and generates the plurality of reference substance image data sets based on a plurality of correction data sets corresponding to the respective tube voltages.