| 摘要 |
A rotating ceptor 20 provided inside a detector portion 10 includes nine shield plates S<SUB>1 </SUB>to S<SUB>9 </SUB>disposed in parallel to each other in between adjacent detector rings R, acts as a collimator, and allows only those photon pairs that have traveled approximately parallel to a slice plane to be made incident upon photon detectors D located behind the rotating ceptor 20 . Each of the shield plates S is not formed annularly, and provided near the measurement field of view 1 of part of N photon detectors D that constitute each of the detector rings R. The rotating ceptor 20 is rotatable about its center axis. Each of the shield plates S is provided with bar-shaped radiation source insertion holes 20 a and 20 b for allowing a bar-shaped positron emission radiation source 3 to be inserted therein and supported thereby.
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