Photon counting apparatus

Abstract

According to an embodiment, The X-ray tube generates X-rays. The X-ray detector detects the X-rays transmitted through a subject. The data acquisition circuitry acquires count data concerning a count number of the detected X-rays for energy bands. The memory circuitry stores data of a response function that associates incident X-rays on the X-ray detector with a response characteristic of a system including the X-ray detector and the data acquisition circuitry. The processing circuitry calculates an X-ray absorption amount of each of a plurality of base substances based on the count data concerning the energy bands acquired by the data acquisition circuitry, an energy spectrum of the incident X-rays, and the response function.

1 . A photon counting apparatus, comprising:
 an X-ray to be configured to generate X-rays;   an X-ray detector configured to detect the X-rays generated by the X-ray tube and transmitted through a subject;   data acquisition circuitry configured to acquire count data concerning a count number of the detected X-rays for at least 16 energy bands, based on an output signal from the X-ray detector;   memory circuitry configured to store data of a response function that associates an energy of incident X-rays on the X-ray detector with a response characteristic of a system including both of the X-ray detector and the data acquisition circuitry; and   processing circuitry configured to calculate an X-ray absorption amount of each of a plurality of base substances based on the count data concerning the at least 16 energy bands acquired by the data acquisition circuitry, an energy spectrum of the incident X-rays generated by the X-ray tube, and the data of the response function stored in the memory circuitry.   
     
     
         2 . An image generating apparatus, comprising:
 memory circuitry configured to store data of a response function that associates energy of incident X-rays on an X-ray detector with a response characteristic of a system including both of the X-ray detector and data acquisition circuitry; and   processing circuitry configured to   acquire count data concerning a count number of X-rays for at least 16 energy bands; and   calculate an X-ray absorption amount of each of a plurality of base substances based on the count data concerning the at least 16 energy bands acquired by the data acquisition circuitry, an energy spectrum of the incident X-rays generated by the X-ray tube, and the data of the response function stored in the memory circuitry.