综合PET/MR和独立PET系统之间的定量[11C]PE2I脑PET研究的比较
João M Sousa1, Lieuwe Appel2, Mathias Engström3
1Nuclear Medicine & PET, Department of Surgical Sciences, Uppsala University, Uppsala, Sweden; Medical Physics, Uppsala University Hospital, Uppsala, Sweden.
概括
定量PET/MR成像显示与独立PET的高相关性,但揭示了偏差. 磁共振耳机和噪音带来了错误,影响了脑PET研究的定量准确性.
科学领域:
- 神经成像是一种神经成像.
- 医学物理 医学物理
- 放射化学 放射化学是指辐射化学.
背景情况:
- 精确的减弱校正 (AC) 对于定量定子发射断层扫描 (PET) 成像至关重要,特别是在混合PET/磁共振成像 (PET/MR) 系统中.
- 在PET/MR和专用PET扫描仪之间的技术和硬件差异可能会影响定量结果.
- 基于传输的AC的专用PET系统被认为是定量大脑PET的黄金标准.
研究的目的:
- 为了比较PET/MR扫描仪和独立PET系统之间的定量PET结果.
- 为了评估多巴胺输送体的结合潜力 (BPND) 和相对传递 (R1) 值的一致性 [11C]PE2I.
- 为了确定定量PET/MR成像中偏差的来源.
主要方法:
- 九名患有帕金森症的患者接受了两次动态PET扫描,使用PET/MR和独立PET系统上的[11C]PE2I.
- 用与分辨率匹配的设置重建图像,使用68Ge传输用于独立PET和零回声时间MR用于PET/MR减弱校正.
- 量化参数,包括不可取代的结合潜力 (BPND) 和相对传递 (R1),使用兴趣区域和voxel-wise分析进行了评估.
主要成果:
- 在所有大脑区域的BPND和R1之间观察到PET/MR和独立PET之间的高相关性 (r ≥0.85).
- 与独立系统相比,在PET/MR (-7%) 上,状体BPND显著较低.
- 在后皮层区域 (+9%) 中,R1被高估,在条状 (-9%) 和边缘 (-6%) 区域被低估. 无MR安全耳机和背景噪声分别带来了负面和积极的偏见.
结论:
- 虽然PET/MR在定量[11C]PE2I成像方面与独立PET具有很高的一致性,但存在系统偏差.
- 特定于MR的因素,如耳机和声噪声,被确定为影响定量准确性的重大错误来源.
- 这些偏差与预期的测试-重新测试可变性相比较,突出显示在临床PET/MR研究中需要仔细考虑.
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