ISSN: ISSN 1896-8961 e-ISSN 2449-9161
Department of Radiotherapy, National Institute of Oncology, Mohammed V University, Rabat, Morocco
Research Article
Electronic portal imaging device-based quantitative quality assurance of millennium MLC via dosimetric Picket-Fence analysis
Author(s): M. Driouch*, Y. Adib, Adeb A.S.A. Almaamari, M. Rachikh, E. Chakir and E. Al Ibrahm
The Multi-leaf collimator is the key component for intensity-modulation-based radiotherapy treatment planning. Numerous errors and uncertainties in leaf position can impact the delivered dose distribution. Our work aims to implement an objective, user-experience-independent approach to efficient MLC quality control. A picket fence test with 9 sweeping gaps was planned in the treatment planning system and delivered on the aS1000 electronic portal imaging device. The output was compared to the TPS calculations using 3%/2 mm gamma passing rate acceptance criterion. The effects of dose rate, collimator rotation angle, and gantry rotation angle on leaf alignment accuracy, beam output, and reproducibility were investigated. We first notice that GPR increases for 400 MU/min compared to 200 and 600 MU/min, because it is the nominal dose rate of our accelerator. Second, the GPR decreased signi.. View More»