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The performance and magnetic shielding of a 6 MV in-line linac in a parallel linac-MR configuration Open Access


Other title
parallel configuration
fringe magnetic flux density
longitudinal magnetic flux density
particle simulation
magnetic shielding
Type of item
Degree grantor
University of Alberta
Author or creator
Santos, Dan Michael Uson
Supervisor and department
Steciw, Stephen (Oncology)
Fallone, Gino (Oncology)
Examining committee member and department
Steciw, Stephen (Oncology)
Fallone, Gino (Oncology)
Marchand, Richard (Physics)
Department of Oncology
Medical Physics
Date accepted
Graduation date
Master of Science
Degree level
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.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
J. St. Aubin, D. M. Santos, S. Steciw and B. G. Fallone. "Effect of longitudinal magnetic fields on a simulated in-line 6 MV linac," Med. Phys., 37, 4916-4923, (2010).

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