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首页> 外文期刊>Physics in medicine and biology. >Evaluation of chamber response function influence on IMRT verification using 2D commercial detector arrays
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Evaluation of chamber response function influence on IMRT verification using 2D commercial detector arrays

机译：使用2D商业探测器阵列评估腔室响应函数对IMRT验证的影响

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摘要

This work is devoted to studying the influence of chamber response functions on the standard IMRT verification for the different detector technologies available on commercial devices. We have tested three of the most used 2D detector arrays for radiotherapy dosimetry verification, based on air-ionization chambers and diode detectors. The response function has been carefully simulated using the Monte Carlo method and measured through slit and pinhole collimators. Although the response function of air-ionization detectors is considerably different with respect to that of standard diodes, the impact on a verification based in the gamma function with tolerances 3 mm and 3% is quite limited. The results show that the standard air-ionization detector arrays perform in a similar way whenever the tolerances for the gamma function are not lowered below 1.5 mm and 1.5%. Additionally, the sensitivity of these devices to fluence perturbations was measured by intentionally modifying some leaf positions in the multileaf collimator. The wider response function of air-ionization chamber arrays made them slightly more sensitive to random fluence perturbations, although silicon diode arrays are more accurate to describe the dose distribution in a point by point basis.
机译：这项工作致力于研究箱响应功能对商用设备上可用的不同检测器技术的标准IMRT验证的影响。我们已经测试了三个最常用的2D检测器阵列，用于基于空气电离室和二极管检测器的放射线剂量学验证。使用蒙特卡洛方法仔细模拟了响应函数，并通过狭缝和针孔准直器对其进行了测量。尽管空气电离检测器的响应功能与标准二极管相比有很大不同，但是基于伽玛功能（公差为3 mm和3％）对验证的影响非常有限。结果表明，只要伽马功能的容差不低于1.5 mm和1.5％，标准的空气电离检测器阵列的性能便类似。此外，通过有意修改多叶准直仪中的某些叶片位置，可以测量这些设备对通量扰动的敏感性。尽管硅二极管阵列更精确地逐点描述剂量分布，但空气电离室阵列更宽的响应功能使它们对随机通量扰动更为敏感。

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