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Skin Dose in Longitudinal and Transverse Linac-MRIs using Monte-Carlo and realistic 3D MRI field models Open Access


Other title
Skin Dose
Type of item
Degree grantor
University of Alberta
Author or creator
Keyvanloo Shahrestanaky, Amirmohamad
Supervisor and department
Dr. B. Falllone, Gino (Oncology-medical Physics)
Dr. Warkentin, Brad (Oncology-medical Physics)
Examining committee member and department
Dr. Rathee, Satyapal (Oncology-medical Physics)
Dr. Marchand, Richard (Physics)
Dr. Warkentin, Brad (Oncology-medical Physics)
Dr. B. Falllone, Gino (Oncology-medical Physics)
Department of Oncology
Medical Physics
Date accepted
Graduation date
Master of Science
Degree level
The integration of a clinical linear accelerator (linac) with a magnetic resonance imaging (MRI) system would provide real-time tumor tracking. The magnetic fields of linac-MR systems modify the path of contaminant electrons in photon beams, which alters patient skin dose. In this work, we used Monte Carlo calculations that incorporate realistic 3D magnetic field models of longitudinal and transverse linac-MR systems to accurately quantify the changes in skin dose. The results show that fringe fields of realistic 3D B-fields decay rapidly and have a very small magnitude at the linac’s head. As a result, for longitudinal linac-MR systems only a small increase in the entrance skin dose is predicted. For transverse linac-MR systems, changes to the entrance skin dose are small for most scenarios. On the exit side, however, a fairly large increase is observed for perpendicular beams due to the electron return effect, but significantly drops for large oblique angles of incidence.
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
Skin dose in longitudinal and transverse linac-MRIs using Monte Carlo and realistic 3D MRI field models A. Keyvanloo, B. Burke, B. Warketin, T. Tadic, S. Rathee, C. Kirkby, D.M. Santos, B.G. Fallone Med Phys 39(11), 6597-6608 (2012)

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