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 Science and Technology.
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We are developing the helmet PET in which detectors are arranged on a hemisphere with an add-on detector for high sensitivity brain imaging. We have developed the helmet-chin PET prototype having the add-on detector at the chin position to improve the sensitivity. However, the add-on detector at the chin position gave an oppressive feeling to the patient, and the moving part of the add-on detector was not convenient for the patient setup. On the other hand, our previous simulation has shown that the add-on detector covering the neck position has an equivalent effect for improving the sensitivity and imaging quality. In this study, therefore, we developed a helmet-neck PET prototype, which has the add-on detector at the neck position, by remodeling our first helmet-chin PET prototype. The prototype has 54 4-layer depth-of-interaction detectors each of which consists of 16x16x4 array of 2.8×2.8×7.5 mm3 Zr-doped GSO scintillators and a 64-ch position sensitivity photomultiplier tube. We measured sensitivity with a hemispherical pool phantom for the brain region, and we found that the add-on detector at the neck position was more effective for improving the sensitivity for the region than that at the chin position. This was because the arrangement of the detector at the chin position requires a larger margin for designing the gantry, in which the detector position becomes farther away than in the case of the neck position. We conducted a healthy volunteer study using the helmet-neck PET prototype. The result showed that the helmet-neck PET has promising performance for high sensitivity brain imaging and improved convenience for patient studies.
会議概要（会議名, 開催地, 会期, 主催者等）
2017 IEEE Nuclear Science Symposium & Medical Imaging Conference
Development of the helmet-neck PET prototype: comparison with the helmet-chin PET
