Performance evaluation of a diode array for enhanced dynamic wedge dosimetry.
Performance evaluation of a diode array for enhanced dynamic wedge dosimetry.
复制标题
用于增强动态楔形剂量测定的二极管阵列的性能评估。
DOI：
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
J. Shi
中科院分区：
文献类型：
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作者：
Timothy C. Zhu;L. Ding;Chihray R Liu;J. Palta;William E. Simon;J. Shi
通过将二极管阵列（Profiler）在不同深度测量的增强动态楔形（EDW）剖面与在商用直线加速器上使用0.03 cm3电离室进行的点测量进行比较，评估了二极管阵列（Profiler）的性能。Profiler的宽度为22.5 cm，通过将三个数据集连接到一个更大的字段中来测量更大的字段宽度。该器件制造商开发了一种创新的宽视场校准技术，用于校准单个二极管的灵敏度，其变化可以超过10%。利用电离室测得的百分比深度剂量曲线，利用该装置在不同深度处测得的EDW剖面构建等剂量曲线。这些等剂量曲线用于检查由商业治疗计划系统产生的等剂量曲线。用二极管阵列测量的8 MV和18 MV光子光束的轮廓与电离室的轮廓在场中的标准偏差为0.4%（定义为场宽度的80%），在半影区域的最大位移小于2mm。除累积区域外，深度剂量百分比一般控制在2%以内。作为EDW的质量保证工具和剂量测量设备，Profiler非常有用，可以节省大量的数据采集时间。
The performance of a diode array (Profiler) was evaluated by comparing its enhanced dynamic wedge (EDW) profiles measured at various depths with point measurements using a 0.03 cm3 ionization chamber on a commercial linear accelerator. The Profiler, which covers a 22.5 cm width, was used to measure larger field widths by concatenating three data sets into a larger field. An innovative wide-field calibration technique developed by the manufacturer of the device was used to calibrate the individual diode sensitivity, which can vary by more than 10%. Profiles of EDW measured with this device at several depths were used to construct isodose curves using the percentage depth dose curve measured by the ionization chamber. These isodose curves were used to check those generated by a commercial treatment planning system. The profiles measured with the diode array for both 8 and 18 MV photon beams agreed with those of the ionization chamber within a standard deviation of 0.4% in the field (defined as 80% of the field width) and within a maximum shift of less than 2 mm in the penumbra region. The percentage depth dose generally agreed to within 2% except in the buildup region. The Profiler was extremely useful as a quality assurance tool for EDW and as a dosimetry measurement device with tremendous savings in data acquisition time.
具有通用楔块的有效楔角。
影响因子：
3.5
作者：
Petti,PL;Siddon,RL
通讯作者：
Siddon,RL