The performance and magnetic shielding of a 6 MV in-line linac in a parallel linac-MR configuration |
Posted on:2013-12-19 | Degree:M.S | Type:Thesis |
University:University of Alberta (Canada) | Candidate:Santos, Dan Michael Uson | Full Text:PDF |
GTID:2452390008972304 | Subject:Biophysics |
Abstract/Summary: | |
To achieve real-time image-guided radiation therapy, the integration of a linear accelerator (linac) with a magnetic resonance (MR) imager has been proposed. This thesis presents work that investigated performance and magnetic shielding of a linac in the presence of parallel magnetic flux densities. This work used computer simulations and numerical techniques such as finite element and particle tracking algorithms. It showed that a linac can operate with only a 17 +/- 1 % target current lost and maintain its treatment beam's symmetry in the presence of 0.011 T parallel magnetic flux densities. Furthermore, the target current lost is the result of the altered electron gun optics when parallel magnetic flux densities are present. Minimal magnetic shielding (such as a 5-mm-thick, 146.5-mm-long passive shield or a pair of active shield coils with 625 and 430 A-turns) around the electron gun and waveguide was demonstrated to recover this lost target current. |
Keywords/Search Tags: | Magnetic, Linac, Target current |
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