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Commissioning measurements on an Elekta Unity MR?Linac

机译：在 Elekta Unity MR 上调试测量？直线加速器

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摘要

Magnetic resonance-guided radiotherapy technology is relatively new and commissioning publications, quality assurance (QA) protocols and commercial products are limited. This work provides guidance for implementation measurements that may be performed on the Elekta Unity MR-Linac (Elekta, Stockholm, Sweden). Adaptations of vendor supplied phantoms facilitated determination of gantry angle accuracy and linac isocentre, whereas in-house developed phantoms were used for end-to-end testing and anterior coil attenuation measurements. Third-party devices were used for measuring beam quality, reference dosimetry and during treatment plan commissioning; however, due to several challenges, variations on standard techniques were required. Gantry angle accuracy was within 0.1 degrees, confirmed with pixel intensity profiles, and MV isocentre diameter was 0.5 mm. Anterior coil attenuation was approximately 0.6%. Beam quality as determined by TPR20,10 was 0.705 +/- 0.001, in agreement with treatment planning system (TPS) calculations, and gamma comparison against the TPS for a 22.0 x 22.0 cm(2) field was above 95.0% (2.0%, 2.0 mm). Machine output was 1.000 +/- 0.002 Gy per 100 MU, depth 5.0 cm. During treatment plan commissioning, sub-standard results indicated issues with machine behaviour. Once rectified, gamma comparisons were above 95.0% (2.0%, 2.0 mm). Centres which may not have access to specialized equipment can use in-house developed phantoms, or adapt those supplied by the vendor, to perform commissioning work and confirm operation of the MRL within published tolerances. The plan QA techniques used in this work can highlight issues with machine behaviour when appropriate gamma criteria are set.
机译：磁resonance-guided放射治疗技术相对较新和调试出版物,质量保证(QA)协议和商业产品是有限的。为实现测量上执行Elekta统一MR-Linac (Elekta斯德哥尔摩,瑞典)。提供幻影的决心龙门角精度和直线加速器等中心,而内部开发的幻影被用于端到端测试和前线圈衰减测量。测量光束质量,参考剂量测定法和在治疗计划调试;几个挑战,变化的标准技术是必需的。像素是在0.1度,确认吗强度资料,MV等中心直径& 大约0.6%。TPR20, 10为0.705 + / - 0.001,同意治疗计划系统(TPS)计算,γ比较对TPS的22.0倍22.0厘米(2)领域超过95.0%(2.0%,2.0毫米)。机输出是1.000 + / - 0.002 Gy / 100亩,深度5.0厘米。调试,结果表明不达标机器的问题行为。γ比较高于95.0%(2.0%,收于2.0点毫米)。可以使用内部开发的专用设备幻影,或适应这些供应商提供的,执行调试和确认工作在发表承受手术的推广。该计划QA技术用于这项工作可以突出问题与机器的行为要设置正确的伽马标准。

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