使用蒙特卡洛计算和相位空间数据对Varian TrueBeam VMAT计划的监控单元验证
Ankit Pant1,2, Narges Miri1, Stephen Bhagroo3
1Department of Radiation Medicine, Roswell Park Comprehensive Cancer Center, Buffalo, New York, USA.
Journal of applied clinical medical physics
|July 20, 2023
概括
开源的蒙特卡洛 (MC) 软件为Varian TrueBeam VMAT计划提供了准确的监控单元 (MU) 验证,性能优于商业的MUCheck软件. 这种MC方法适合临床实施.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 计算剂量计计算剂量计.
背景情况:
- 准确验证治疗计划系统 (TPS) 计算对于放射治疗中的患者安全至关重要.
- 瓦里安TrueBeam线性加速器提供体积调节弧疗法 (VMAT) 计划,需要强大的监控单元 (MU) 验证方法.
- 现有的商业软件对于复杂的VMAT计划的准确性可能有局限性.
研究的目的:
- 评估开源蒙特卡罗 (MC) 软件对TPS监控单元 (MU) 验证Varian TrueBeam线性加速器交付的VMAT计划的有效性.
- 使用AAPM任务组219指南,将MC计算的准确性和效率与商业软件产品 (MUCheck) 和TPS (Eclipse) 进行比较.
- 建立一个可靠的MC框架,用于VMAT计划验证中的临床实施.
主要方法:
- 在EGSnrc中模拟Varian TrueBeam线性加速器,使用Varian提供的相位空间文件.
- 使用计算集群模拟13个VMAT TrueBeam治疗计划,跨越多个不同的解剖区域 (共37个弧度).
- 在Eclipse,MC和MUCheck之间的每弧五个参考点的点剂量差异的比较,使用每弧5×107粒子历史的MC模拟.
主要成果:
- 具有5 × 10 7历史的MC模拟表明与Eclipse有很好的一致性,平均绝对剂量差异为3.0%,只有22%的点超过了5%的作用极限.
- 商业软件MUCheck显示了更高的平均绝对差异8.4%,60%的点数超过了5%的行动限制,特别是与肺部计划 (约. 这是一个16%的差异).
- MC计算提供了合理的平均计划计算时间 (每个完整计划9-18分钟),并且在MU验证方面明显优于MUCheck.
结论:
- 一个基于EGSnrc的MC框架对于MU验证VMAT计划在Varian TrueBeam上是有效的.
- 该MC相位方法可适应其他处理设备,具有适当的相位文件.
- 使用5×107历史的MC方法始终符合临床作用限制,并提供了商业MU验证软件的优越替代方案,有可能广泛采用临床.
更多相关视频
相关概念视频
Computed Tomography
Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Positron Emission Tomography
Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...


