在获得形束计算机断层扫描时头部倾斜的变化及其对有效辐射剂量的影响
Arthur X M Mancini1, Gabriela A Carmozini2, Thiago M Inácio2
1Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, Sao Paulo, 14040-904, Brazil.
Dento maxillo facial radiology
|August 12, 2024
概括
在形束计算断层扫描 (CBCT) 过程中调整头部倾斜可以减少辐射暴露. 增加前后后头角和侧倾斜远离视野较低的有效剂量,特别是唾液腺.
科学领域:
- 放射学 放射学是一门学科.
- 医疗成像医学成像
- 辐射剂量计 辐射剂量计
背景情况:
- 圆束计算断层扫描 (CBCT) 在牙科和医学中广泛使用.
- 优化CBCT参数对于最小化患者辐射剂量至关重要.
- 在CBCT采集过程中,头部的角度可以影响器官和有效剂量.
研究的目的:
- 评估头角变化对CBCT中辐射剂量的影响.
- 为了比较三个不同的CBCT机器的剂量减少.
- 为了确定最大限度地减少有效剂量的最佳头部位置.
主要方法:
- 在三个CBCT机器 (OP300,Eagle X 3D,Eagle Edge) 中使用了一个人形幻影.
- 热发光剂量计测量器官/组织剂量后下和前大部扫描.
- 扫描是在不同的前后部 (0°,30°,45°) 和侧部 (0°,±20°) 头部角度进行的.
主要成果:
- 增加的前后角 (30°,45°) 降低了所有下后部扫描机器的有效剂量.
- 偏离视野 (FOV) 的20°侧倾斜降低了剂量,而不是倾斜到FOV.
- 增加的前后角降低了两台前部扫描机的有效剂量.
结论:
- 视野小的CBCT考试受益于增加头部前后角 (30°,45°) 以降低有效剂量.
- 侧头偏离FOV进一步减少后下成像中的有效剂量.
- 唾液腺通过这些优化的角化技术获得明显较低的剂量.
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