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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：使用不同的设置评估针对特定患者的VMAT QA的2D检测器阵列。

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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：为了对诸如强度调制电弧疗法之类的先进治疗技术的治疗前计划进行验证，需要一种快速，可靠的剂量学设备。在这项研究中，我们调查了MatriXX在不同设置下验证容积调制电弧治疗（VMAT）计划的适用性。如果将MatriXX用于固定体模（MULTICube）中，则测得的剂量取决于光束角。对于第一个设置（MatriXX / MULTICube），我们为每个检测器元件（1020 CF）开发了校正因子（CF）。我们通过验证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MatriXX在专用支架中的适用性。使用此设置（MatriXX / Holder），还验证了30个其他VMAT计划。对于在90度和180度龙门位置的离子室之一，发现最大偏差约为17％和11％。当选择2％/ 2 mm的伽玛标准时，可以清楚地看到光束角度依赖性（MULTICube）的影响。在应用依赖于光束角度的CF后，可观察到总体改善了4.3％的通过像素（pp）。当伽玛标准为3％/ 3 mm时，％pp为> / = 95％（无校正）和约100％（校正）。使用第二个设置MatriXX / holder，我们在测量和计算之间表现出了极好的一致性。所有计划（30个VMAT治疗计划）的平均pp值接近100％。事实证明，将MatriXX与MULTICube或与支架结合使用是一种快速，可靠的方法，可以以足够的准确性对电弧疗法进行预处理验证。

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