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首页> 外文期刊>Radiation Protection Dosimetry >Dosimap: A High-resolution 2-d Tissue Equivalent Dosemeter For Linac Qa And Imrt Verification
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Dosimap: A High-resolution 2-d Tissue Equivalent Dosemeter For Linac Qa And Imrt Verification

机译：Dosimap：用于直线加速器质量保证和Imrt验证的高分辨率二维组织等效剂量仪

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摘要

New generation of radiation therapy accelerators requires highly accurate dose measurements with high spatial resolution patterns. IMRT is especially demanding since the positioning accuracy of all the multi-leafs should be verified for each applied field and at any incidence. A new 2-D tissue equivalent dosemeter is presented with high spatial resolution that can fulfil these tasks. A plastic scintillator sheet is sandwiched between two polystyrene cubes, and the emitted light is observed by a high-resolution camera. A patented procedure allows efficient discrimination of the scintillation proportional to the dose from the parasitic Cerenkov radiation. This extraction made on the cumulated images taken during an irradiation field at a rate of 10 images s~(-1) provides high-resolution mapping of the dose rate and cumulated dose in quasi real time. The dosemeter is tissue equivalent (ICRU-44) and works both for electrons and photons without complex parameter adjustment, since phantom and detector materials are identical. The calibration is simple and independent of the irradiation conditions (energy, fluence, quality and so on). The principle of the dosemeter and its calibration procedure are discussed in this paper. The results and, in particular, the dose depth profiles are compared with standard ionisation chamber measurements in polystyrene for both photons and electrons. Finally, the detector specifications are summarised and one example of complex IMRT field is discussed.
机译：新一代放射治疗加速器需要具有高空间分辨率模式的高精度剂量测量。 IMRT尤其苛刻，因为应针对每个应用领域以及在任何入射情况下验证所有多叶的定位精度。提出了一种新型的二维组织等效剂量仪，具有较高的空间分辨率，可以完成这些任务。将塑料闪烁体片夹在两个聚苯乙烯立方体之间，并通过高分辨率照相机观察所发出的光。一项获得专利的程序可以有效区分与寄生切伦科夫辐射的剂量成正比的闪烁。在辐射场期间以10幅图像s〜（-1）的速率对累积图像进行的这种提取提供了剂量率和累积剂量的准实时高分辨率映射。剂量计是组织等效的（ICRU-44），由于幻像和检测器材料相同，因此无需复杂的参数调整即可用于电子和光子。校准很简单，并且与辐照条件（能量，通量，质量等）无关。本文讨论了剂量计的原理及其校准程序。将结果，尤其是剂量深度曲线与聚苯乙烯中光子和电子的标准电离室测量结果进行比较。最后，总结了探测器的规格，并讨论了一个复杂的IMRT场的例子。

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