Fig 1.
Cross-sectional views parallel to (a) y-axis and (b) x-axis of the modeled treatment room with labeled components.
Fig 2.
Varian Clinac 2300 C/D accelerator head view from (a) x-y plane and (b) 3-dimensional snapshots.
(Note: only a few major parts visible from the x-y plane were labeled).
Fig 3.
The five irradiation positions (P1, P2, P3, P4 and P5) chosen as targets in the present study.
The red dots represent the positions of irradiation.
Fig 4.
Simplified schematic diagram showing the concept of (a) serial (conventional) computing and (b) parallel computing using multi-processor compute units.
Fig 5.
Dispersion of primary photons (shown in blue) and secondary electrons (shown in green) during the radiotherapy treatment at different irradiation positions: (a) testes (P1), (b) colon (P2), (c) liver (P3), (d) left lung (P4) and (e) brain (P5).
The snapshots were generated using the Vised visualizer.
Fig 6.
Benchmarking of the present model against the experimental data from Varian Clinac 2300 linear accelerator model through percent dose depth (PDD).
(Solid line: experimental data; dotted line: our model).
Fig 7.
Photon energy distribution exiting from the linear accelerator operating at 6 MV after beam filtration and collimation.
Fig 8.
Comparison between the absorbed doses in major tissues of the adult male phantom during head irradiation obtained using a 137Cs point source [27] and a 6 MV linear accelerator beam in the present work.
The results from irradiation at the brain (P5) in the present work were used for comparison with the results in ref. [27].
Table 1.
Absorbed doses in targeted tissues for different irradiation positions P1 to P5 using the 6 MV linear accelerator beam.
Fig 9.
Variations in F for the skin and skeleton obtained at different irradiation positions P1 to P5 using the 6 MV linear accelerator beam.
Fig 10.
Variations in F for the brain, spine and esophagus obtained at different irradiation positions P1 to P5 using the 6 MV linear accelerator beam.
Fig 11.
Variations in F for the heart, left and right lung obtained at different irradiation positions P1 to P5 using the 6 MV linear accelerator beam.
Fig 12.
Dispersed doses delivered to non-targeted tissues in an example which determined the dispersed doses during a CHART (continuous hyper-fractionated accelerated radiotherapy) treatment of lung cancer.