Radiation detector

摘要

Provided is a radiation detector that prevents a decline in detection efficiency as well as having excellent temporal characteristics. The radiation detector 1, which detects a radiation, includes a scintillator array 10 having a plurality of scintillator cells 11, a photodetector array 20 having a plurality of photodetectors 21, and a photodetector array 30 having a plurality of photodetectors 31. The plurality of photodetectors 21 and the plurality of photodetectors 31 are solid-state photodetectors that can transmit a gamma ray G1, G2. The scintillator cell 11 is separated into a plurality of light emitting regions 11a, 11b by a reflecting region 12, and the reflecting region 12 extends between the incident surface 10a side and the back surface 10b side along a surface SP that is inclined with respect to the incident surface 10a and the back surface 10b.

主权项

1. A radiation detector array for a TOF-PET (Time of Flight—Positron Emission Tomography) device that is configured to be able to collect DOI (Depth of Interaction) information, the radiation detector array comprising:
a radiation detector set that performs coincidence counting, the radiation detector set including a pair of radiation detectors disposed on a circumference of a circle substantially centered on a measuring object, the radiation detectors of the pair being located on opposite sides of the circle across the measuring object, wherein each of the radiation detectors comprises:
a scintillator array including an incident surface on which a radiation is incident, a back surface located on a side opposite to the incident surface, and a plurality of scintillator cells which are arrayed two-dimensionally on the incident surface;a first photodetector array which is provided on the incident surface; anda second photodetector array which is provided on the back surface; the scintillator array is provided between the first photodetector array and the second photodetector array; the first photodetector array has a plurality of first photodetectors which are arrayed two-dimensionally along the incident surface; the second photodetector array has a plurality of second photodetectors which are arrayed two-dimensionally along the back surface; the first and second photodetectors are radiation-transmissive photodetectors, and at least the first photodetectors are each configured to receive and transmit gamma rays; and each of the scintillator cells includes a plurality of light emitting regions which absorb an incident radiation and generate scintillation light, and a first reflecting region which is configured to reflect the scintillation light generated by a first one of the light emitting regions.