在大脑血管造影期间,高分辨率圆束计算机断层扫描 (HR-CBCT) 中对器官和有效剂量的估计
Hitoshi Miyazaki1,2, Toshioh Fujibuchi3, Donghee Han3
1Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1- 1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan. miyazaki.hitoshi.036@m.kyushu-u.ac.jp.
Radiological physics and technology
|October 31, 2025
概括
在脑血管造影期间,高分辨率的形光束CT提供了详细的成像,但涉及辐射暴露. 这项研究使用先进的蒙特卡洛模拟准确估计了器官和有效剂量,为更好的患者辐射保护提供了工具.
科学领域:
- 医疗成像医学成像
- 辐射剂量计 辐射剂量计
- 计算物理 计算物理
背景情况:
- 在脑血管造影中,高分辨率的形光束CT (HR-CBCT) 提供了卓越的空间分辨率,但引起了对辐射暴露的担忧.
- 目前缺乏HR-CBCT的详细器官剂量 (OD) 和有效剂量 (ED) 评估,这阻碍了准确的风险评估.
研究的目的:
- 用蒙特卡洛模拟来准确估计HR-CBCT的OD和ED,这些模拟可以考虑投射特定的X射线输出变化.
- 推导出用于临床应用的剂量转换系数,使得从空气基马面积产品测量中能够对实际剂量进行估计.
主要方法:
- 利用NCIRF蒙特卡洛软件模拟HR-CBCT扫描的幻影代表四个脑动脉瘤易发的网站.
- 记录了每个投射角度的曝光参数,并计算了OD和ED.
- 通过将计算的透镜剂量与放射光发光玻璃剂量计的测量结果进行比较,验证了模拟准确性.
主要成果:
- 大脑最大OD为46.2mGy (男性) 和61.7mGy (女性).
- 有效剂量在0.70-0.89mSv (男性) 和0.86-1.11mSv (女性) 之间.
- 模拟方法与测量镜片剂量 (<6.0%差异) 有很好的一致性,与传统方法相比,剂量误差降低了20%左右.
结论:
- 动态蒙特卡洛模拟,结合投影特定的暴露变化,提供HR-CBCT的高度准确的剂量估计.
- 衍生转换系数为优化临床环境中患者辐射保护提供了一个实用的工具,具有类似的设备和协议.
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