Journal Article <論文・報告>PET 検査とSPECT 検査の原理実証実験

徳地, 研人  ,  生駒, 洋樹  ,  芝内, 菜緒  ,  越川, 亜美  ,  村田, 求基  ,  古野, 達也  ,  津村, 美保  ,  川畑, 貴裕

1pp.41 - 47 , 2016-03 , 京都大学学際融合教育研究推進センター高大接続科学教育ユニット
理学 物理学
Positron Emission Tomography (PET) is a modern diagnostic method for cancer. A medical agent labeled with a positron-emitting radioactive isotope called a tracer is injected into the body. Positrons emitted by the tracer annihilate electrons, and pairs of gamma rays are consequently emitted in opposite directions. Coincidence measurements of the two gamma rays can determine the position of positron- electron annihilation. If we use a tracer that tends to concentrate within cancer cells, the PET scan becomes useful for imaging cancer within the body. In this study, 22Na was used as the positron emitter. Gamma rays were detected by 8 scintillation detectors consisting of GAGG (Gd3Al2Ga3O12) scintillators mounted on avalanche photodiodes. We carried out coincidence measurements of the two gamma rays, and demonstrated the principle behind PET scans. Additionally, we demonstrated the single-photon emission computed tomography (SPECT) scan used in cancer testing, and compared its performance with that of the PET scan.

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