| 摘要 |
PURPOSE:To enable data acquisition of emission and transmission without fixing a subject person for a long time by collecting the data masked and the data unmasked by two data acquisition means. CONSTITUTION:A subject person 14 is inserted in the ring shape arrangement of a multitude of radiation detector 11 and a line source 12 is rotated around the subject person 14 along the ring shape arrangement by a rotary drive system 13. When the diminish of positron emitted by the RI (radioactive isotope) in the source 12 and the subject person 14 is detected 1, two beams of gamma rays are emitted to 180 deg. direction and are detected by individual detectors 11 entering simultaneously. From each signal, the combination of detectors 1 which is identified by a coincidence circuit 2, is address converted 41, 42 and counted in a data collection memory 51, 52. In one converter 42, an emission data masked at the part of the source 12 is obtained and a transmission data is obtained from the difference of memories 51 and 52.
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