在双能量圆束CT扫描协议中,用于剂量优化的优点的一个可概括的新数字
Chenguang Li1,2, Li Zhou3, Jun Deng4
1Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing, 100142, People's Republic of China.
Physics in medicine and biology
|August 24, 2023
概括
一个新的度量,FOMn,通过平衡辐射剂量和多尺度图像质量来优化双能量圆束CT (DE-CBCT) 协议,以获得更好的患者成像.
科学领域:
- 医学物理 医学物理
- 放射性成像学成像学
- CT CT 技术 技术 技术
背景情况:
- 双能量圆束CT (DE-CBCT) 提供了更好的材料差异化,但需要仔细的协议优化.
- 平衡辐射剂量与多尺度图像质量对于有效的DE-CBCT扫描协议至关重要.
- 现有的优点数字可能无法充分捕捉不同尺度中剂量和图像质量之间的复杂相互作用.
研究的目的:
- 为优化DE-CBCT扫描协议提出和评估一个新的优点数字 (FOMn).
- 将尺寸依赖的辐射剂量建模和多尺度图像质量纳入统一的指标.
- 评估FOMn在各种幻影尺寸和DE-CBCT成像协议中的性能.
主要方法:
- 使用Z分数规范化开发FOMn,强调剂量效率和多尺度图像质量 (CCNR,CED).
- 实验使用了四种定制幻影尺寸 (直径200-380毫米) 的CatPhan604插件.
- 使用25个协议 (100/140kVp,不同管电流) 获取DE-CBCT数据,并使用代方法处理.
主要成果:
- 电子密度准确率为~1%,但随着幻影尺寸的增加而下降.
- 最佳协议平衡了全面的对比度与噪声比率 (CCNR) 和电子密度 (CED),电压/电流组合各不相同.
- 在人类形象幻影试验中,FOMn指导的协议证明了剂量效率,证实了它的有效性.
结论:
- FOMn提供了对DE-CBCT的辐射剂量和多尺度图像质量的全面评估.
- 该指标的发现突显出需要考虑多尺度图像质量,以准确优化DE-CBCT协议.
- 开发的模型和数据可以作为个性化,剂量高效的DE-CBCT协议的查找表.
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