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Comparison of the effectiveness of different immobilization systems in different body regions using daily megavoltage CT in helical tomotherapy

机译:每日兆伏CT螺旋断层扫描法比较不同固定系统在不同身体部位的有效性

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摘要

Objective: Effective immobilization is crucial for the accurate delivery of radiotherapy. This study aimed to compare the effectiveness of the commonly used immobilization systems for different body regions using megavoltage CT (MVCT). Methods: Daily treatment set-up data from 212 patients treated by helical tomotherapy (Accuray, Sunnyvale, CA) in 6 body regions (52 head and neck, 41 chest, 38 abdomen, 36 pelvis, 18 breast and 27 cranium) were obtained. Based on a verification tool using the pre-treatment MVCT, set-up corrections for each patient were recorded. Mean systematic and random errors of lateral, longitudinal, vertical and roll directions and three-dimensional vectors were compared between immobilization systems of each region. Results: Smaller set-up deviations were observed in the Orfit system (Orfit Industries NV, Wijnegem, Belgium) of the head and neck region, while the performance of immobilization systems for the chest, abdomen and pelvis regions was similar. Larger differences were noted in the breast group, where the prone BodyFIX® system (Medical Intelligence, Medizintechnik GmbH, Schwabmünchen, Germany) was less stable than the supine VacLok® system (CIVCO Medical Solutions, Orange City, IA). Conclusion: Differences were found between the immobilization systems in the head and neck region, in which the Orfit system was relatively more effective, whereas the VacLok and BodyFIX systems performed similarly in the chest, abdomen and pelvis regions. For the breast case, the supine position with VacLok was much more stable than the prone breast technique. The results provided references for the estimation of clinical target volume-planning target volume margins. Advances in knowledge: This is the first article on comprehensive comparisons performed in immobilization systems for main body regions that provides some practical recommendations.
机译:目的:有效的固定对于准确放疗至关重要。这项研究旨在比较使用兆电压CT(MVCT)的不同身体部位常用固定系统的有效性。方法:获得212例接受螺旋CT(Accuray,Sunnyvale,CA)治疗的6个身体部位(52个头颈部,41个胸部,38个腹部,36个骨盆,18个乳房和27个颅骨)的患者的日常治疗数据。基于使用预处理MVCT的验证工具,记录了每个患者的设置校正。比较每个区域的固定系统之间的横向,纵向,垂直和侧倾方向的平均系统误差和随机误差以及三维矢量。结果:在头部和颈部区域的Orfit系统(Orfit Industries NV,比利时Wijnegem,比利时)中观察到较小的设置偏差,而在胸部,腹部和骨盆区域的固定系统的性能相似。乳房组的差异更大,其中俯卧的BodyFIX®系统(医学智能,Medicintechnik GmbH,德国施瓦布明兴,德国)不如仰卧VacLok®系统(CIVCO Medical Solutions,奥兰治城,爱荷华州)稳定。结论:在头颈部区域的固定系统之间存在差异,其中Orfit系统相对更有效,而VacLok和BodyFIX系统在胸部,腹部和骨盆区域的表现相似。对于乳腺病例,VacLok的仰卧姿势比俯卧乳术更为稳定。研究结果为临床目标量规划,目标量余量的估计提供了参考。知识进步:这是第一篇有关固定系统在主体区域进行的综合比较的文章,提供了一些实用建议。

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    Cheng, KF; Wu, VWC;

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  • 年度 2014
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