Positioning accuracy of cone-beam computed tomography in combination with a hexapod robot treatment table
Positioning accuracy of cone-beam computed tomography in combination with a hexapod robot treatment table
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DOI：
10.1016/j.ijrobp.2006.11.010
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发表时间：
2007-03-15
影响因子：
7
通讯作者：
Flentje, Michael
中科院分区：
文献类型：
--
作者：
Meyer, Juergen;Wilbert, Juergen;Flentje, Michael
目的：为了仔细检查商业六足机器人治疗台（HRTT）与用于图像引导放射治疗（IGRT）的商业锥形束计算机断层扫描系统组合的定位精度和再现性，方法和材料：X射线体积成像（XVI）系统的机械稳定性在再现性方面进行测试，并且关注可移动部件，即，kV面板和源臂对使用头颈体模的骨和灰度值配准的再现性和准确性的影响。在连续的测量中，研究了平移、旋转以及平移和旋转校正组合的HRTT的准确性。HRTT的操作范围也被确定和analysed.Results：单独的XVI系统的系统性能是非常稳定的平均平移和旋转误差低于0.2毫米和低于0.2度，分别。在所有测量中总结的HRTT与XVI系统组合的平均定位精度分别低于0.3 mm和低于0.3度（平移和旋转校正）。结论：XVI图像采集和配准过程具有较高的可重复性。平移和旋转定位误差都可以用HRTT非常精确地校正。因此，HRTT非常适合于补充锥形束计算机断层扫描，以充分利用IGRT六个自由度的位置校正。XVI和HRTT的组合有可能提高高精度治疗的准确性。(c)2007年爱思唯尔公司
Purpose: To scrutinize the positioning accuracy and reproducibility of a commercial hexapod robot treatment table (HRTT) in combination with a commercial cone-beam computed tomography system for image-guided radiotherapy (IGRT).Methods and Materials: The mechanical stability of the X-ray volume imaging (XVI) system was tested in terms of reproducibility and with a focus on the moveable parts, i.e., the influence of kV panel and the source arm on the reproducibility and accuracy of both bone and gray value registration using a head-and-neck phantom. In consecutive measurements the accuracy of the HRTT for translational, rotational, and a combination of translational and rotational corrections was investigated. The operational range of the HRTT was also determined and analyzed.Results: The system performance of the XVI system alone was very stable with mean translational and rotational errors of below 0.2 mm and below 0.2 degrees, respectively. The mean positioning accuracy of the HRTT in combination with the XVI system summarized over all measurements was below 0.3 mm and below 0.3 degrees for translational and rotational corrections, respectively. The gray value match was more accurate than the bone match.Conclusion: The XVI image acquisition and registration procedure were highly reproducible. Both translational and rotational positioning errors can be corrected very precisely with the HRTT. The HRTT is therefore well suited to complement cone-beam computed tomography to take full advantage of position correction in six degrees of freedom for IGRT. The combination of XVI and the HRTT has the potential to improve the accuracy of high-precision treatments. (c) 2007 Elsevier Inc.