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- W1986219970 abstract "Purpose: The Varian TrueBeam is equipped with two new flattening filter free (FFF) beams at 6 MV and 10 MV. We generate the dose kernel of the new 6X FFF beam using Monte Carlo for a treatment planning system using pencil beam convolution dose calculation. Methods: The particle transport through a treatment head model was simulated using the EGSnrc/BEAMnrc codes. The simulation was verified by comparing the simulated and measured PDDs in a water phantom. Energy spectra were derived from the resultant phase‐space files of different field sizes. For all field sizes, a 1 mm pencil beam was assigned with the corresponding energy spectrum and was used as the source to generate the dose kernel in DOSRZnrc. Dose kernel was simulated in thin concentric rings with different radii (0.05–45 cm) at different depths (1.5–40 cm) in a water phantom, 100 cm in radius and 50 cm in height. For verification, dose calculation of off‐axis ratios and half‐blocked field profiles using the new kernel were compared with the corresponding water tank measurements of different field sizes and depths. Results: Compared to 6X, the energy spectrum of the 6XFFF beam is approximately 0.3 MeV lower in mean energy for a 10 × 10 field. More importantly, it was found that energy spectrum is not significantly dependent on field size for the 6XFFF beam, i.e. there was only a difference of 0.06 MeV in mean energy between a 10 × 10 and 30 × 30 field while this was >0.32 MeV for 6X. Profile calculated using the 6XFFF kernel matches the measurement within 0.5 mm at the 80%–20% beam penumbra region. Conclusions: Different from 6X, energy spectrum of 6XFFF beam is independent of field size. 6XFFF dose kernel is also found to be invariant of field size. Research partially supported by Varian Medical Systems." @default.
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- W1986219970 date "2011-06-01" @default.
- W1986219970 modified "2023-09-25" @default.
- W1986219970 title "SU-E-T-725: Dose Kernel of 6 MV FFF Beam in TrueBeam for Pencil Beam Convolution Algorithms" @default.
- W1986219970 doi "https://doi.org/10.1118/1.3612687" @default.
- W1986219970 hasPublicationYear "2011" @default.
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