This study aims to present a report on the commissioning results of the Varian TrueBeamTMSVC Medical Linear Accelerator with available Flattening filter (FF) and Flattening filter free (FFF) photon beams and to compare their dosimetric differences and advantages. This study intends to benefit medical physicists and biomedical engineers during installation and commissioning. All evaluations followed TG-106 guidelines and regulations from the Atomic Energy regulatory board. Determination and comparison of parameters involved PDD (Percentage depth dose), Depth dose profile, Symmetry, Flatness, Quality index, Relative output factor, Penumbra, Transmission factor, DLG (Dosimetric leaf gap), in addition to the degree of Un-flatness and the off-axis ratio of and mechanical test such as Gantry, collimator, couch isocentric check. The 6MVFFF and 10MVFFF beams had the same average energy as the flattened beams and exhibited fewer PDD differences with varying field sizes. The depth of maximum dose (Dmax) was greater for FFF beams across all field sizes compared to their flattened beam counterparts. The symmetry values were almost identical while the flatness values of 6 MV FFF and 10 MV FFF normalized profiles were expected to be higher than the corresponding flattened beams. The surface doses for all beams increased linearly with the field size. For field sizes up to 10 ×10cm2, the 6MVFFF and 10MVFFF beams exhibited increased surface doses compared to the flattened beams, whereas for larger fields, the surface doses were lower. Additionally, both FFF beams had reduced average MLC transmissions in comparison to the flattened beams.
Rajadurai et al. (Tue,) studied this question.
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