PHOTON-COUNTING CT APPARATUS, MEDICAL IMAGE PROCESSOR, PHOTON-COUNTING CT IMAGING METHOD, AND MEDICAL IMAGE PROCESSING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a photon-counting CT apparatus capable of definitely discriminating the energy spectrum relating to a target site of a subject from the energy spectrum of the X rays emitted from an X-ray tube.SOLUTION: A radiation detector 151 detects X rays transmitted through a subject and gamma rays emitted from a radiopharmaceutical administered to the subject. A setting unit 33 sets an energy threshold value for separation of an energy band where X rays are predominant from an energy band where gamma rays are predominant. A spectrum data generation unit 37 generates an X-ray spectrum dataset belonging to the X-ray predominant energy band and a gamma ray spectrum dataset belonging to the gamma ray predominant energy band, on the basis of output signals from the radiation detector 151 and the set energy threshold value.SELECTED DRAWING: Figure 1