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首页> 外文期刊>Physics in medicine and biology. >Evaluation of a 2D detector array for patient-specific VMAT QA with different setups.
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Evaluation of a 2D detector array for patient-specific VMAT QA with different setups.

机译：用不同设置的患者特定VMAT QA评估2D探测器阵列。

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摘要

For pre-treatment plan verification of advanced treatment techniques such as intensity-modulated arc therapy, a fast and reliable dosimetric device is required. In this study, we investigated the suitability of MatriXX in different setups for verification of volumetric modulated arc therapy (VMAT) plans. If MatriXX is used in a stationary phantom (MULTICube), the measured dose is dependent on the beam angle. For the first setup (MatriXX/MULTICube), we developed correction factors (CFs) for each detector element (1020 CFs). We investigated the accuracy of these CFs by verifying 12 VMAT plans. In the second setup, we also assessed the suitability of MatriXX in a dedicated holder. Using this setup (MatriXX/Holder), 30 additional VMAT plans were verified. Deviations of up to approximately 17% and approximately 11% were noted for one of the ion chambers at 90 degrees and 180 degrees gantry positions. The influence of the beam angle dependence (MULTICube) can explicitly be seen when a gamma criterion of 2%/2 mm was chosen. An overall improvement of 4.3% of passing pixels (pp) was noted after applying beam angular-dependent CFs. When the gamma criterion was 3%/3 mm, the %pp was >/= 95% without and approximately 100% with correction. With the second setup, MatriXX/holder, we showed excellent agreement between measurements and calculations. The %pp averaged over all plans (30 VMAT treatment plans) was nearly approximately 100%. The combination of MatriXX with MULTICube or with holder proved to be a fast and reliable method for pretreatment verification of arc therapy with sufficient accuracy.
机译：对于先进的治疗技术，例如强度调制弧治疗，快速和可靠的剂量测定装置的预处理方案验证是必需的。在这项研究中，我们调查MATRIXX的适用性不同的菜单中进行的容积调制弧治疗（VMAT）计划验证。如果MATRIXX在静止体模（MULTICube）中使用时，测得的剂量依赖于光束角。对于第一个设置（MATRIXX / MULTICube），我们开发了校正因子（CFS）对于每个探测器元件（1020 CFS）。我们通过核实12个VMAT计划调查了这些CF的准确性。在第二种设置中，我们还评估了一个专用的支架MATRIXX的适用性。使用此设置（MATRIXX /座），30个额外的VMAT计划进行了核实。高达约17％，约11％的偏差，注意到在90度和180点的位置龙门的离子室中的一个。被选择的2％/ 2mm的伽马标准当光束角依赖性（MULTICube）的影响可以明确地看到。的传递像素（PP）的4.3％的总体改善被应用波束角依赖性的CF后指出。当伽马标准是3％/ 3毫米，％PP为> / = 95％不具有和具有校正约100％。随着第二设置，MATRIXX /持有者，我们发现，测量和计算之间的良好的协议。在％PP平均超过所有的计划（30个VMAT治疗计划）几乎接近100％。 MATRIXX与MULTICube或与支架的组合被证明是用于电弧疗法以足够的精度的预处理验证一个快速和可靠的方法。

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