Comparison of two commercial detector arrays for IMRT quality assurance.
Comparison of two commercial detector arrays for IMRT quality assurance.
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DOI：
10.1120/jacmp.v10i2.2942
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发表时间：
2009-04-29
影响因子：
2.1
通讯作者：
Liu C
中科院分区：
文献类型：
--
作者：
Li JG;Yan G;Liu C
比较了两种商用探测器阵列在患者特定IMRT治疗计划的质量保证中的应用：一种是基于二极管的阵列(MapCHECK)，另一种是基于电离室的阵列(Matrixx)。测量了探测器的响应对场大小、剂量率和辐射能量的依赖关系，并与使用Farmer类型电离室的参考测量结果进行了比较。为了了解系统的稳定性和不确定度，还检查了探测器响应的线性度、短期和长期重现性、作为传递剂量函数的统计不确定度以及阵列校准的有效性。在研究中使用的场大小和SSD的范围内，在6 mV和18 mV光子能量下没有观察到场大小或SSD依赖。两个探测器阵列在测量超过的剂量时都显示出可以忽略不计的误差，但在测量1cGy量级的剂量时显示出误差。虽然MapCHECK在测量误差范围内表现出稳定的短期重复性，但Matrixx在最初的一小时内显示出缓慢但持续的读数增加(约0.8%)。MapCHECK还显示出略好的阵列灵敏度校正，所有检测器的偏差小于1%，超过90%的检测器的偏差在0.5%以内，而约60%的Matrixx检测器的偏差小于0.5%，偏差大于1%。Matrixx探测器也表现出与其直径大小一致的体积平均效应。在考虑Matrixx的体积平均效应后，与治疗计划系统的3个6 mV IMRT野和3个18 mV IMRT野的平面剂量分布相比，两个探测器阵列的通过率都很高。PAC数量：87.55公里；87.55季度；87.56.Fc
Two commercially available detector arrays were compared for their use in the quality assurance of patient‐specific IMRT treatment plans: one a diode‐based array (MapCHECK) and the other an ion chamber‐based array (MatriXX). The dependence of the response of detectors on field size, dose rate, and radiation energy was measured and compared with reference measurements using a Farmer‐type ionization chamber. The linearity of the detector response, short‐term and long‐term reproducibility, statistical uncertainty as a function of delivered dose, and the validity of the array calibration were also examined to understand the stability and uncertainty of the systems. No field size or SSD dependence was observed within the range of the field sizes and SSDs used in the study at both 6 MV and 18 MV photon energies. Both detector arrays showed negligible errors when measuring doses of more than , but exhibited errors of when measuring doses on the order of 1 cGy. While the MapCHECK showed a stable short‐term reproducibility to within measurement error, the MatriXX showed a slow but continuous increase in readings during the initial one‐hour period (about 0.8%). The MapCHECK also showed a slightly better array sensitivity correction with all the detectors having less than 1% discrepancy and more than 90% of the detectors within 0.5% variation, whereas about 60% of the MatriXX detectors showed a less than 0.5% variation and exhibited a larger than 1% discrepancy. MatriXX detectors also displayed a volume‐averaging effect consistent with its detector size of in diameter. Excellent passing rates were obtained for both detector arrays when compared with the planar dose distributions from the treatment planning system for three 6 MV IMRT fields and three 18 MV IMRT fields after the volume‐averaging effect of the MatriXX was taken into account. PACS number: 87.55.km; 87.55.Qr; 87.56.Fc
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DOI：
10.1016/0360-3016(93)90206-b
发表时间：
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影响因子：
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