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H Qu, P Qi, N Yu, P Xia
PURPOSE: To implement and validate a method of using electronic portal image device (EPID) for pre-treatment quality assurance (QA) of volumetric modulated arc therapy (VMAT) plans using flattering filter free (FFF) beams for stereotactic body radiotherapy (SBRT). METHODS: On Varian Edge with 6MV FFF beam, open field (from 2×2 cm to 20×20 cm) EPID images were acquired with 200 monitor unit (MU) at the image device to radiation source distance of 150cm. With 10×10 open field and calibration unit (CU) provided by vendor to EPID image pixel, a dose conversion factor was determined by dividing the center dose calculated from the treatment planning system (TPS) to the corresponding CU readout on the image...
June 2016: Medical Physics
I Tsougos, K Theodorou, M A Bazioglou, S Stathakis, C Kappas
PURPOSE: To compare Monte Carlo simulation with conventional dosimetry techniques for stereotactic radiotherapy (SRT), since accurate dosimetry of narrow photon beams is very complicated and has often been questioned, mainly due to the lack of lateral electronic equilibrium and uncertainty in beam energy in terms of steep dose gradients. MATERIALS AND METHODS: In this work a Monte Carlo (MC, EGS4) simulation for dosimerty study was performed for the 6MV home made SRT unit of the University Hospital of Patras (Hellas)...
October 2004: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
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