X-RAY COMPUTED TOMOGRAPHY APPARATUS

摘要

An X-ray computed tomography apparatus according to an embodiment stores a plurality of reference count data indicative of energy spectra of X-rays, which are associated with a plurality of tube voltages or tube currents. Estimation circuitry estimates a tube voltage or a tube current at a time of X-ray irradiation, based on a comparison of energy spectra between second count data and each of the plurality of reference count data. Correction circuitry corrects first count data acquired together with the second count data, by using an energy spectrum calculated based on the estimated tube voltage or tube current. Reconstruction circuitry reconstructs medical image data, based on the corrected first count data.

主权项

1. An X-ray computed tomography apparatus comprising:
an X-ray tube configured to radiate X-rays; a first X-ray detector configured to count X-ray photons in a first region of the radiated X-rays, and to acquire energy of the X-ray photons; a second X-ray detector configured to count X-ray photons in a second region of the radiated X-rays, and to acquire energy of the X-ray photons; count result acquisition circuitry configured to acquire count results of the first and second X-ray detectors, and to output first and second count data indicative of energy spectra of X-rays; memory circuitry configured to store a plurality of reference count data indicative of energy spectra of X-rays, which are associated with a plurality of tube voltages or tube currents for radiating X-rays from the X-ray tube; estimation circuitry configured to estimate a tube voltage or a tube current at a time of X-ray irradiation, based on a comparison of energy spectra between the second count data and each of the plurality of reference count data; correction circuitry configured to correct the first count data acquired together with the second count data, by using an energy spectrum calculated based on the estimated tube voltage or tube current; and reconstruction circuitry configured to reconstruct medical image data, based on the corrected first count data.