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首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >The design and evaluation of a phantom for the audit of the treatment chain for prostate radiotherapy.
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The design and evaluation of a phantom for the audit of the treatment chain for prostate radiotherapy.

机译：人体模型的设计和评估，用于审核前列腺放射治疗的治疗链。

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BACKGROUND AND PURPOSE: A phantom has been designed and built for a multi-institutional technique audit of the planning and delivery for radiotherapy to the prostate. The phantom was designed to test both the geometric and dosimetric accuracy of each aspect of the process. MATERIALS AND METHODS: The phantom consists of two curved water filled perspex tanks either side of a central block of solid water equivalent material. There are two options for the central section; a target defining block and a dose measurement block. The target defining block uses air holes to define a 3-D target volume for imaging via a CT scanner or a simulator. These holes can subsequently be filled with steel pins to allow megavoltage imaging. The dose measurement block allows thimble chamber measurements to be made at pre-selected points in a 5x5mm array. Five dose measurement points, typical for a prostate planning target volume (PTV) were selected. Initial evaluation of the phantom was performed by auditing the prostate radiotherapy planning and treatment chain at one institution. RESULTS: Agreement between the phantom and planned geometry confirmed that the stages of image acquisition, transfer and manipulation were accurately performed. Agreement within 0.5% was found between phantom and water tank measurements for dose calibration at a reference point. The measured dose delivered was within 2% of the dose calculated by the planning computer for all of the selected measurement points. The target volume marked by the steel pins was visible using electronic portal imaging. CONCLUSIONS: The phantom is a useful tool for the technique audit of prostate radiotherapy.
机译：背景与目的：已经设计并制造了一种幻影，用于多机构技术审计，以规划和向前列腺进行放射治疗。体模旨在测试过程各个方面的几何精度和剂量学精度。材料与方法：体模由两个弯曲的充满水的有机玻璃水箱组成，该水箱位于固体水当量材料中央部分的两侧。中央部分有两个选项;目标定义块和剂量测量块。目标定义模块使用气孔来定义3-D目标体积，以通过CT扫描仪或模拟器进行成像。这些孔随后可以用钢销填充，以进行兆电压成像。剂量测量模块允许在5x5mm阵列中的预先选择的点进行套管室测量。选择了五个剂量测量点，通常用于前列腺计划目标体积（PTV）。幻像的初始评估是通过审核一所机构的前列腺放射治疗计划和治疗链来进行的。结果：体模和计划的几何图形之间的一致性证实了图像采集，转移和操纵的阶段是准确进行的。幻影和水箱测量之间的一致性在0.5％以内，用于在参考点进行剂量校准。对于所有选定的测量点，所传递的测量剂量在计划计算机计算的剂量的2％以内。使用电子门禁成像可以看到由钢钉标记的目标体积。结论：体模是前列腺癌放射治疗技术审核的有用工具。

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