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用多层条带电离室 (MLSIC) 装置测量质子3D剂量

Shuang Zhou¹, Qinghao Chen¹, Jonathan Haefner¹

¹Department of Radiation Oncology, Physics Division, Washington University in St. Louis School of Medicine, St. Louis, MO 63108, United States of America.

Physics in medicine and biology

|June 6, 2024

概括

一个新的多层条带电离室 (MLSIC) 装置使强度调节质子疗法 (IMPT) 的3D剂量测量成为可能. 这一进步为当前和未来的质子疗法技术提供了高分辨率的质量保证.

科学领域:

医学物理医学物理
辐射瘤学辐射瘤学
剂量测量方法剂量测量方法

背景情况:

目前强度调制质子疗法 (IMPT) 的质量保证 (QA) 依赖于在有限深度的二维剂量测量.
像FLASH放射治疗这样的新兴技术需要先进的QA工具,能够进行高时空分辨率的3D剂量测量.
需要一个质量控制设备,可以准确地测量IMPT的全3D剂量分布.

研究的目的:

为了证明在IMPT领域使用专用多层条带电离室 (MLSIC) 装置进行3D剂量测量的可行性.
开发和验证用于从MLSIC测量生成3D剂量分布的重建算法.

主要方法:

开发了一种具有66层条形离子化室的MLSIC设备,能够在25 × 25 cm2的场面尺寸上以6kfps测量768个频道.
使用双高斯 - 考希 - 洛伦茨模型实现了重建算法,以重建单个质子斑点和全束光束的3D剂量分布.
使用临床笔束扫描 (PBS) 计划评估了MLSIC的性能,将测量结果与模拟 (Zebra,MatriXX) 进行比较.

主要成果:

成功重建了单个质子斑点的3D剂量分布,并将它们相加,以获得光束的完整3D剂量分布.
3D马指数分析显示,MLSIC测量和模拟工具的剂量分布之间存在可接受的一致性.
MLSIC证明了其在PBS质子场中的点对点3D剂量测量的能力.

结论:

开发的MLSIC是第一个能够测量PBS质子场3D剂量分布的伪3DQA设备.
这项技术为IMPT提供了质量保证的重大进步,支持现有实践和FLASH放射治疗等新技术.
MLSIC提供高分辨率的3D剂量验证,提高质子疗法治疗的准确性和可靠性.

关键词:

这就是IMPT.多层条带电离室多层条带电离室质子QA质子QA质子QA

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