EP-1460: Detection of forced errors in VMAT plans using EPID and Epiqa dosimetric system
نویسندگان
چکیده
منابع مشابه
Evaluation of a fast method of EPID-based dosimetry for IMRT and Comparison with 3D EPID-based dosimetry system using conventional two- and three-dimensional detectors for VMAT
Introduction: Electronic portal imaging devices (EPIDs) could potentially be useful for intensity-modulated radiation therapy (IMRT) and VMAT QA. The data density, high resolution, large active area, and efficiency of the MV EPID make it an attractive option. However, EPIDs were designed as imaging devices, not dosimeters, and as a result they do not inherently measure dose in ...
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Partial transmission through rounded leaf ends of Varian multileaf collimators (MLC) is accounted for with a parameter called the dosimetric leaf gap (DLG). Verification of the value of the DLG is needed when the dose delivery is accompanied by gantry rotation in VMAT plans. We compared the doses measured with GAFCHROMIC film and an ionization chamber to treatment planning system (TPS) calculat...
متن کاملBenchmarking the gamma pass score using ArcCHECK for routine dosimetric QA of VMAT plans
A minimum expected gamma (γ) pass rate for VMAT plan verification using ArcCHECK was established based on the RTTQA, TG119 test cases and 10 clinical plans with varying levels of complexity. The impact of the ‘Measurement Uncertainty’ parameter as available in the ArcCHECK software on γ pass rate was studied for both global and local γ analysis. Our results show that excluding measurement uncer...
متن کاملSU-E-T-164: Clinical Implementation of ASi EPID Panels for QA of IMRT/VMAT Plans.
PURPOSE To investigate various issues for clinical implementation of aSi EPID panels for IMRT/VMAT QA. METHODS Six linacs are used in our clinic for EPID-based plan QA; two Varian Truebeams, two Varian 2100 series, two Elekta Infiniti series. Multiple corrections must be accounted for in the calibration of each panel for dosimetric use. Varian aSi panels are calibrated with standard dark fiel...
متن کاملA comprehensive EPID-based 3D validation technique for TrueBeam-delivered VMAT plans
Purpose: To develop and validate a pre-treatment EPI dosimetry method on Varian TrueBeam linacs using continuous imaging, with reconstruction in a 3D cylindrical phantom geometry. Methods: Delivery of VMAT plans with continuous imaging is currently possible only in Research Mode on TrueBeam linacs, with images acquired in a proprietary format. An earlier technique was adapted to take advantage ...
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ژورنال
عنوان ژورنال: Radiotherapy and Oncology
سال: 2017
ISSN: 0167-8140
DOI: 10.1016/s0167-8140(17)31895-9