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在儿科瘤学患者中减小剂量 延迟全身 [18F]FDG PET/CT
Clemens Mingels1,2, Benjamin A Spencer3, Hande Nalbant3
1Department of Radiology, University of California Davis, Sacramento, California; clemens.mingels@insel.ch.
概括
在儿科[18F]FDG全身PET/CT中减少注射活性是可行的. 建议最低剂量为0.5MBq/kg,以保持病变明显性和延迟成像中的可比瘤吸收.
科学领域:
- 核医学就是核医学.
- 儿科瘤学 儿科瘤学
- 放射化学 放射化学是指辐射化学.
背景情况:
- 延迟[18F]FDG全身PET/CT成像对于儿科瘤学至关重要.
- 优化注射活动对于平衡诊断准确性和辐射剂量至关重要.
- 为了有效的临床实践,需要确定减少活性的下限.
研究的目的:
- 确定 [18F]FDG在儿科瘤学中延迟全身PET/CT的最小有效注射剂量.
- 为了评估减少放射性追踪器活动对图像质量和病变检测的影响.
- 为注入的[18F]FDG活动建立安全有效的下限.
主要方法:
- 未来的单中心研究涉及儿科患者接受延迟[18F]FDG结核病PET/CT.
- 模拟剂量降低,通过对清单模式数据进行亚抽样,使其达到参考数量的1/4,1/8,1/16和1/32.
- 对信号与噪声比率,瘤与背景比率以及对比与噪声比率进行定量分析.
- 由三个医生进行的图像质量和病变识别的独立评估.
主要成果:
- 在18名患者中分析了113个恶性病变,其中87.6%是可量化的.
- 在所有低数重建中观察到降低的信号噪声比.
- 瘤吸收率,瘤与背景比率和病变数量在剂量减少1/16和1/32时显著下降.
- 在所有降低剂量重建中,对比度与噪音比率和临床图像质量显著下降.
结论:
- 儿童延迟[18F]FDG结核病PET/CT可以耐受剂量降低,而不会影响图像质量或病变明显性.
- 为了保持诊断性能,注射的[18F]FDG活性不应降低到0.5 MBq/kg以下,在120分钟后延迟成像时.
- 这一发现支持在儿科PET/CT成像中优化放射追踪剂量.
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