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  • http://hdl.handle.net/10402/era.24913
  • The performance and magnetic shielding of a 6 MV in-line linac in a parallel linac-MR configuration
  • Santos, Dan Michael Uson
  • English
  • longitudinal magnetic flux density
    magnetic shielding
    linac-mr
    parallel configuration
    fringe magnetic flux density
    particle simulation
  • Jan 4, 2012 2:16 PM
  • Thesis
  • English
  • Adobe PDF
  • 5735271 bytes
  • 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.
  • 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).
  • Master's
  • Master of Science
  • Department of Oncology
  • Medical Physics
  • Spring 2012
  • Steciw, Stephen (Oncology)
    Fallone, Gino (Oncology)
  • Fallone, Gino (Oncology)
    Steciw, Stephen (Oncology)
    Marchand, Richard (Physics)