建议通过减少图像导向辐射治疗的圆束计算机断层扫描中的成像场宽度来降低晶体透镜暴露剂量:一个人形幻影研究
Tatsuya Yoshida1,2, Koji Sasaki3, Tomoki Hayakawa4
1Department of Radiology, Koritsu Tatebayashi Kosei General Hospital, Gunma, Japan. ssty900.9145@gmail.com.
Radiological physics and technology
|May 1, 2024
概括
在脑束计算机断层扫描 (CBCT) 中减少X射线孔径 (叶片X2) 可以显著降低图像导向放射治疗 (IGRT) 期间的晶透镜辐射剂量. 这种技术保持了准确的患者定位,以获得有效的治疗.
科学领域:
- 医学物理 医学物理
- 放射学 放射学是一门学科.
- 辐射瘤学 辐射瘤学
背景情况:
- 头癌的图像导向放射治疗 (IGRT) 依赖于圆束计算断层扫描 (CBCT) 精确定位患者.
- 晶状透镜对辐射敏感,尽量减少剂量对于预防辐射引起的白内障至关重要.
- 优化CBCT成像参数对于平衡诊断准确性和辐射安全至关重要.
研究的目的:
- 通过缩小头部CBCT中的X射线孔径 (叶片X2) 来评估对晶体透镜的剂量降低效应.
- 评估光圈缩小对IGRT自动骨匹配准确性的影响.
- 确定减少光圈大小是否是头部CBCT中剂量优化的可行策略.
主要方法:
- 圆束计算机断层扫描 (CBCT) 在头部幻影上进行.
- 使用放射光发光剂量计 (RPLD) 来测量晶状镜片暴露剂量,其X2孔径大小各不相同 (13.6厘米至5.0厘米).
- 自动骨匹配的准确性是通过将位置校正与幻影移位后不同的X2光圈设置 (13.6厘米与5.0厘米) 进行比较来评估的.
主要成果:
- 在5.0厘米X2光圈下,最大降低了右晶透镜剂量38.7%,左晶透镜剂量13.2%.
- 13.6厘米和5.0厘米孔径之间的位置校正最大差异为1毫米.
- 自动骨匹配的准确性在测试的孔径大小中保持相似,表明定位没有妥协.
结论:
- 在头部CBCT中缩小X射线孔径 (叶片X2) 是减少晶状镜片辐射暴露的有效方法.
- 这种剂量降低技术不会对IGRT的自动骨匹配的准确性产生不利影响.
- 减少X2孔径是提高头部CBCT手术患者安全的有价值策略.
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