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首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >Verification of patient position and delivery of IMRT by electronic portal imaging.
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Verification of patient position and delivery of IMRT by electronic portal imaging.

机译：通过电子门户成像验证患者位置和IMRT的输送。

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BACKGROUND AND PURPOSE: The purpose of the work presented in this paper was to determine whether patient positioning and delivery errors could be detected using electronic portal images of intensity modulated radiotherapy (IMRT). PATIENTS AND METHODS: We carried out a series of controlled experiments delivering an IMRT beam to a humanoid phantom using both the dynamic and multiple static field method of delivery. The beams were imaged, the images calibrated to remove the IMRT fluence variation and then compared with calibrated images of the reference beams without any delivery or position errors. The first set of experiments involved translating the position of the phantom both laterally and in a superior/inferior direction a distance of 1, 2, 5 and 10mm. The phantom was also rotated 1 and 2 degrees . For the second set of measurements the phantom position was kept fixed and delivery errors were introduced to the beam. The delivery errors took the form of leaf position and segment intensity errors. RESULTS: The method was able to detect shifts in the phantom position of 1mm, leaf position errors of 2mm, and dosimetry errors of 10% on a single segment of a 15 segment IMRT step and shoot delivery (significantly less than 1% of the total dose). CONCLUSIONS: The results of this work have shown that the method of imaging the IMRT beam and calibrating the images to remove the intensity modulations could be a useful tool in verifying both the patient position and the delivery of the beam.
机译：背景与目的：本文提出的目的是确定是否可以使用调强放射治疗（IMRT）的电子门户图像来检测患者的定位和分娩错误。病人和方法：我们进行了一系列的控制实验，使用动态和多重静态场传递方法将IMRT光束传递到人形体模。对光束成像，对图像进行校正以消除IMRT能量密度变化，然后将其与参考光束的校正图像进行比较，而不会产生任何传递或位置误差。第一组实验涉及将幻影的位置横向和沿上/下方向平移1、2、5和10mm的距离。幻影也旋转了1度和2度。对于第二组测量，幻像位置保持固定，并且将传输误差引入到光束中。传递错误采取叶片位置和线段强度错误的形式。结果：该方法能够在15段IMRT步骤的单个段上检测出幻像位置偏移1mm，叶片位置误差为2mm，剂量测定误差为10％，并且能够进行枝条递送（显着少于总数的1％剂量）。结论：这项工作的结果表明，对IMRT光束进行成像并校准图像以去除强度调制的方法可能是验证患者位置和光束传输的有用工具。

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