量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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Yttrium-90 (Y-90) is almost exclusively a high-energy beta-particle emitting radionuclide used in radiotherapy. Generally, Y-90 are imaged by bremsstrahlung SPECT. However, the images demonstrate a low quality. Thus, we considered using a Compton camera. 30 MBq of Y-90 was encapsulated in a glass bottle. The bottle was set at the center of a water filled NEMA phantom. A Si/CdTe Compton camera was set under the bottle and the distance was 10 cm. Then the bremsstrahlung X-ray was measured for six hours. We found that the image quality depended on the energy window of the Compton camera. The Y-90 source was clearly imaged with 300-400 keV energy window and the spatial resolution was highest.
Y-90 Bremsstrahlung Imaging using Compton Camera
