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在MR指导放射治疗 (MRgRT) Linac上的机械和辐射同心的表征

Nema Bassiri^1,2, John E Bayouth³, Kathryn E Mittauer^1,2

¹Department of Radiation Oncology, Miami Cancer Institute, Baptist Health South Florida, Miami, Florida, USA.

Journal of applied clinical medical physics

|August 3, 2023

概括

这项研究对MR指导放射治疗 (MRgRT) 系统的机械精度进行了基准测试,用于立体射线手术. 半光束块技术在评估几何准确性方面表现出高灵敏度,这对于精确的辐射传递至关重要.

科学领域:

医学物理医学物理
辐射瘤学辐射瘤学
放射治疗技术放射治疗技术

背景情况:

在MR指导放射治疗 (MRgRT) 中实施立体射线手术 (SRS) 需要精确的机械几何精度.
没有内置探测器的MR Linac系统需要可靠的准确性评估方法.
半光束块 (HBB) 技术利用探测器的灵敏度进行机械测试.

研究的目的:

为了对MR Linac系统缺乏内置探测器的机械精度进行基准测试.
为了评估沙发的几何准确性,多叶合仪 (MLC) 和门架.
为MRgRT立体射线外科手术计划奠定基础.

主要方法:

使用HBB几何与电离室配置文件 (ICP) 阵列用于MLC斜率,光束分歧和同中心定位.
通过0.2毫米的增量移动探测器来表征探测器的灵敏度 (ICP-X,ICP-Y).
经过验证的HBB ICP准确性与放射性染色电影明星镜头以及C臂Linac上的可复制性.

主要成果:

HBB技术的灵敏度为6.4%/毫米 (ICP-X) 和13.0%/毫米 (ICP-Y).
沙发的位置精度和 sag 在±0.1毫米内;MLC位移高达0.7毫米;MLC斜率在0.07°.
梁分歧位移在0.03毫米以内;通道角在0.1°以内;可重复的同心点定位.

结论:

HBB技术提供了一种敏感且经过验证的方法来表征MR Linac的机械精度.
这一评估对于实施MR指导型立体术放射外科手术至关重要.
该研究验证了先进放射治疗所需的几何精度.

关键词:

在MLC中,MLC是MLC,MLC是MLC.在 MR-RT QA 系统中.关于MR的指导在MRgRTRT中,您可以使用MRgRT.这里是异中心 (isocenter).机械机械机械机械机械

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