由于在双能量计算机断层扫描中对能量依赖的剂量不确定性
Daisuke Kawahara1, Takatoshi Toyoda2, Kazushi Yokomachi2
1Department of Radiation Oncology, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima City, Japan.
Polish journal of radiology
|July 5, 2023
概括
评估了双能计算断层扫描 (DECT) 的剂量不确定性. 能源依赖导致3.0%的绝对剂量不确定性,可通过单能光束或有效能量测量来减少.
科学领域:
- 医学物理 医学物理
- 放射性成像学成像学
背景情况:
- 双能计算断层扫描 (DECT) 使用不同的X射线光谱来提高材料差异化.
- 在DECT中准确的剂量评估对于患者的安全性和诊断疗效至关重要.
- 波蒂波器是DECT系统中必不可少的组件,塑造X射线束并影响剂量分配.
研究的目的:
- 量化DECT.中能量依赖带来的绝对剂量不确定性.
- 为了研究不同型号 (大型和小型) 蝶结波器对剂量不确定性的影响.
- 在两个不同的能量水平 (80 kV和140 kV) 上评估剂量不确定性.
主要方法:
- 在80 kV和140 kV峰值千伏 (kVp) 时进行DECT扫描.
- 为了进行比较,单能计算机断层扫描 (CT) 扫描在120kVp获得.
- 绝对剂量是使用从的半值层 (HVL) 获得的质量能量吸收系数来计算的.
主要成果:
- 在80kV和140kV的小子过器和水对空气比率之间观察到2.0%的剂量差异.
- 在相同的条件下,在大型蝶结过器中发现了3.0%的差异.
- 大型和小型蝶结过器之间的剂量差异较大,发生在较低的管电压下.
结论:
- 归因于能量依赖的总体绝对剂量不确定性被确定为3.0%.
- 使用120kVp的单能光束可以减轻这种剂量不确定性.
- 使用DECT光束的平均有效能量测量提供了另一种方法来减少剂量不确定性.
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