Accuracy of a 3D laser/camera surface imaging system for setup verification of the pelvic and thoracic regions in radiotherapy treatments
Accuracy of a 3D laser/camera surface imaging system for setup verification of the pelvic and thoracic regions in radiotherapy treatments
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DOI：
10.1118/1.4769428
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发表时间：
2013-01-01
期刊：
影响因子：
3.8
通讯作者：
Bucciolini, Marta
中科院分区：
文献类型：
--
作者：
Pallotta, Stefania;Simontacchi, Gabriele;Bucciolini, Marta
目的：本文的目的是研究激光/相机表面成像系统（Sentinel）在胸部或骨盆区域治疗患者时的准确性，并评估系统的使用条件和患者设置程序，以提供更准确的结果。方法：该系统在两组患者中进行了测试，考虑了不同的患者设置程序和哨兵就业条件。对于第一组33名患者（FG），没有改变通常的设置程序，并考虑将表面延伸限制在治疗区域。对于第二组14例患者（SG），体外体表（包括不靠近治疗部位的身体部位）的再现性进行了优化，并捕获了更宽的体表。在所有情况下，通过对比同时采集Sentinel和锥束CT （CBCT）共192次的配准结果，对系统的准确性进行了评估。在这两种情况下，从计划CT研究中提取的体表作为参考，但对于SG，也使用了Sentinel系统在首次治疗时捕获的体表数据。结果：在报告CBCT和Sentinel配准参数的第90百分位分布中，FG的绝对差异小于6.4 mm和3.8度。SG (
Purpose: The aim of this paper is to investigate the accuracy of a laser/camera surface imaging system (Sentinel) when used on patients treated in the thorax or pelvic regions and to evaluate system employment conditions and patient setup procedures that provide more accurate results.Methods: The system was tested on two groups of patients for whom different patient setup procedures and Sentinel employment conditions were considered. For the first group of 33 patients (FG) no changes to the usual setup procedures were made and a surface extension limited to the treated region was considered. For the second group of 14 patients (SG) the reproducibility of external body surfaces, including body parts not in close proximity to the treatment site, was optimized and a wider surface was captured. In all cases the system accuracy was evaluated comparing registration results from concurrent Sentinel and cone beam CT (CBCT) acquisitions for a total of 192 occasions. External body surfaces, extracted from planning CT studies, were used as reference in both cases, but for SG also surface data captured by Sentinel system at the first treatment were employed.Results: In the 90th percentile of the distributions reporting CBCT and Sentinel registration parameters, absolute differences for FG were less than 6.4 mm and 3.8 degrees. Better performances were observed for SG (