School of Allied Health Sciences, Kitasato University, 1-15-1, Kitasato, Minamiku, Sagamihara, Kanagawa, 252-0373, Japan.
Graduate School of Medical Sciences, Kitasato University, 1-15-1, Kitasato, Minamiku, Sagamihara, Kanagawa, 252-0373, Japan.
Radiol Phys Technol. 2020 Jun;13(2):170-176. doi: 10.1007/s12194-020-00565-4. Epub 2020 May 2.
A novel traceable point-like Ge/Ga source was developed for calibration of positron emission tomography (PET) scanners. The source was equipped with a spherically symmetric acrylic positron absorber. The physical characteristics of photons emitted from the point-like source were evaluated by Monte Carlo simulation, considering possible geometrical uncertainties. The calibration factor of a clinical PET/CT scanner was evaluated using four manufactured point-like sources as a practical application of the point-like source. The results were consistent with that determined by the conventional cross-calibration method. The traceable point-like Ge/Ga source is expected to be a simple and practical tool for determining the calibration factor and evaluating the physical characteristics of PET scanners.
一种新型可追踪的点状锗/镓源被开发用于正电子发射断层扫描（PET）扫描仪的校准。该源配备了一个球对称的丙烯酸正电子吸收体。通过蒙特卡罗模拟，考虑到可能的几何不确定性，评估了点状源发射的光子的物理特性。通过将四个制造的点状源用作点状源的实际应用，评估了临床 PET/CT 扫描仪的校准因子。结果与传统的交叉校准方法确定的结果一致。可追踪的点状锗/镓源有望成为一种简单实用的工具，用于确定 PET 扫描仪的校准因子和评估其物理特性。
