对CT-to-physical密度表的评估,用于多个图像重建功能,用于放射治疗治疗计划的大孔扫描仪
Takuro Okumura1, Akito S Koganezawa2, Takeo Nakashima1
1Department of Clinical Practice and Support, Hiroshima University Hospital, Hiroshima 734-8551, Japan.
概括
这项研究发现,Aquilion Exceed LB计算机断层扫描 (CT) 扫描仪的图像重建功能 (IRF) 和扫描参数对CT值和辐射剂量的影响最小,表明无需改变CT-to-physical density (CT-PD) 表用于放射治疗计划.
科学领域:
- 医学物理 医学物理
- 放射治疗技术 放射治疗技术
- 诊断成像 诊断成像 诊断成像
背景情况:
- 精确的CT成像对于放射治疗治疗计划至关重要.
- 图像重建功能 (IRF) 和扫描参数可以影响CT值和辐射剂量.
- CT-to-physical density (CT-PD) 表对于将CT数量转换为剂量计算的电子密度至关重要.
研究的目的:
- 评估Aquilion Exceed LB CT扫描仪用于放射治疗规划的性能.
- 评估不同IRF (AiCE,AIDR) 和扫描参数对CT值和辐射剂量的影响.
- 为了确定CT-PD表是否需要在不同的IRF和扫描条件下进行调整.
主要方法:
- 通过改变每个IRF的管电流,斜率,视野 (FOV) 和幻影位置来研究CT值.
- 将CT值与使用过后投影 (FBP) 获得的参考值进行比较.
- 使用具有不同IRF的固体幻影,评估剂量深度的变化.
主要成果:
- 对于大多数IRF和扫描参数组合,CT值 (ΔHU) 的变化一般在±10 HU内,物理密度 (ΔPD) 在±0.02 g/cm3内.
- 幻影位置变化导致在扫描FOV内在±25 HU内的ΔHU,在FOV外有更大的偏差.
- 对于不同的IRF,深度剂量变化在±0.5%以内,除了物质边界.
结论:
- Aquilion Exceed LB CT扫描仪在各种IRF和用于放射治疗计划的扫描参数中显示出稳定的性能.
- 对CT值和辐射剂量的观察到的变化不需要对标准CT-PD表进行更改.
- 这项研究支持在CT扫描仪上一致使用CT-PD表与评估的IRF.
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