首页> 外文期刊>International Journal of Radiation Oncology, Biology, Physics >Geometric accuracy of a real-time target tracking system with dynamic multileaf collimator tracking system.
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Geometric accuracy of a real-time target tracking system with dynamic multileaf collimator tracking system.

机译:具有动态多叶准直仪跟踪系统的实时目标跟踪系统的几何精度。

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PURPOSE: Dynamically compensating for target motion during radiotherapy will increase treatment accuracy. A laboratory system for real-time target tracking with a dynamic MLC has been developed. In this study, the geometric accuracy limits of this DMLC target tracking system were evaluated. METHODS AND MATERIALS: A motion simulator was programmed to follow patient-derived tumor motion paths, parallel to the leaf motion direction. A target attached to the simulator was optically tracked, and the leaf positions adjusted to continually align the DMLC beam aperture to the target. Analysis of the tracking accuracy was based on video images of the target and beam alignment. The system response time was determined and the tracking error measured. Response time-corrected tracking accuracy was also calculated to investigate the accuracy limits of an improved system. RESULTS: The response time of the system is 160 +/- 2 ms. The geometric precision for tracking patient motion is 0.6 to 1.1 mm (1 sigma) for the 3 patient datasets tested, with tracking errors relative to the original patient motion of 35, 40, and 100%. CONCLUSIONS: A DMLC target tracking system has been developed that can account for detected motion parallel to the leaf motion direction. The tracking error has a negligible systematic component. Reducing the response time will further increase the overall system accuracy.
机译:目的:在放射治疗过程中动态补偿目标运动将提高治疗准确性。已经开发了用于通过动态MLC进行实时目标跟踪的实验室系统。在这项研究中,评估了该DMLC目标跟踪系统的几何精度极限。方法和材料:对运动模拟器进行编程,使其遵循患者来源的肿瘤运动路径,平行于叶片运动方向。对附着在模拟器上的目标进行光学跟踪,并调整叶片位置以将DMLC光束孔径连续对准目标。跟踪精度的分析基于目标的视频图像和光束对准。确定系统响应时间并测量跟踪误差。还计算了响应时间校正的跟踪精度,以研究改进系统的精度限制。结果:系统的响应时间为160 +/- 2毫秒。对于测试的3个患者数据集,用于跟踪患者运动的几何精度为0.6到1.1 mm(1 sigma),相对于原始患者运动的35、40和100%具有跟踪误差。结论:已经开发了一种DMLC目标跟踪系统,该系统可以考虑平行于叶片运动方向的检测运动。跟踪误差的系统成分可以忽略不计。减少响应时间将进一步提高整体系统精度。

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