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- Title
Accounting for the fringe magnetic field from the bending magnet in a Monte Carlo accelerator treatment head simulation.
- Authors
O'Shea, Tuathan P; Foley, Mark J; Faddegon, Bruce A
- Abstract
Monte Carlo (MC) simulation can be used for accurate electron beam treatment planning and modeling. Measurement of large electron fields, with the applicator removed and secondary collimator wide open, has been shown to provide accurate simulation parameters, including asymmetry in the measured dose, for the full range of clinical field sizes and patient positions. Recently, disassembly of the treatment head of a linear accelerator has been used to refine the simulation of the electron beam, setting tightly measured constraints on source and geometry parameters used in simulation. The simulation did not explicitly include the known deflection of the electron beam by a fringe magnetic field from the bending magnet, which extended into the treatment head. Instead, the secondary scattering foil and monitor chamber were unrealistically laterally offset to account for the beam deflection. This work is focused on accounting for this fringe magnetic field in treatment head simulation.
- Publication
Medical physics, 2011, Vol 38, Issue 6, p3260
- ISSN
0094-2405
- Publication type
Journal Article
- DOI
10.1118/1.3592640