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[用基于SiPM的PET/CT扫描仪对低剂量全身FDG PET的评估:使用全剂量扫描数据的随机采样进行视觉和半定量分析]
Takato Inomata1, Kaoru Sato1, Masanobu Ibaraki1
1Department of Radiology and Nuclear Medicine, Akita Cerebrospinal and Cardiovascular Center.
Nihon Hoshasen Gijutsu Gakkai zasshi
|August 30, 2023
概括
新的光倍增器 (SiPM) PET/CT扫描仪允许低剂量成像. 这项研究模拟了剂量降低,发现25%的数据提供了视觉上可接受的全身18F-FDG PET图像,SUVmax差异最小.
科学领域:
- 核医学就是核医学.
- 医学成像技术 医学成像技术
- 放射化学 放射化学是指辐射化学.
背景情况:
- 光倍增器 (SiPM) PET/CT扫描仪比光倍增管 (PMT) 系统提供了更好的灵敏度和计数率性能.
- 这一进步有望实现低剂量全身PET扫描的潜力,同时保持诊断图像质量.
- 在临床环境中验证低剂量协议存在道德挑战.
研究的目的:
- 用模拟技术研究剂量减少对重建的PET/CT图像的影响.
- 评估在基于SiPM的扫描仪上使用减少事件数据用于全身18F-FDG PET扫描的可行性.
- 为了确定可接受的图像质量和定量准确性的最低数据值.
主要方法:
- 在标准剂量 (3.5 MBq/kg) 下使用Biograph Vision (SiPM) 扫描仪获得的21名受试者的全身18F-FDG PET/CT数据被追溯分析.
- 获取的列表模式数据的样本减少到原始事件数的50%,25%,12.5%和6.25%,以模拟低剂量协议.
- 重建的图像通过比较SUVmax在全剂量和低剂量数据集之间的异常吸收区域 (n=54) 进行视觉和定量评估.
主要成果:
- 从25%的数据重建的图像在视觉上被认为是可以接受的.
- 全剂量 (100%) 和25%的数据图像之间的SUVmax的平均差异为9.8±13.5%.
- 较低的数据百分比 (12.5%,6.25%) 没有明确详细说明,但根据25%的结果暗示不太可接受.
结论:
- 生物视觉PET/CT扫描仪证明了剂量减少策略的可行性.
- 使用25%的获取数据可能是一个可行的方法来减少临床全身18F-FDGPET成像中的辐射剂量.
- 可能需要进一步验证,以建立用于常规临床使用的特定低剂量协议.
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