Defense Date
2026
Document Type
Thesis
Degree Name
Master of Science
Department
Medical Physics
First Advisor
William Song
Second Advisor
Christopher Guy
Third Advisor
Tianjun Ma
Abstract
Magnetic resonance guided radiation therapy (MRgRT) combines magnetic resonance imaging (MRI) and radiation therapy to enable the visualization of anatomy in real time during treatment. The presence of a magnetic field in MRgRT affects charged particle radiation and detector responses, necessitating changes to traditional reference dosimetry procedures. The American Association of Physicists in Medicine (AAPM) Task Group 351 (TG-351) provides a formalism for reference dosimetry in MRgRT. In this study, the TG 351 formalism is used to perform reference dosimetry for a 6 MV flattening filter-free (FFF) photon beam from a Viewray MRIdian MR-Linac radiation therapy system. Beam quality determination, magnetic field correction factors, and radial profile corrections for FFF beams are included in the calculation for absorbed dose to water. An overview is given for the experimental setup, geometry, and data processing. The procedures enable a framework for reference dosimetry in MRgRT environments.
Rights
© The Author
Is Part Of
VCU University Archives
Is Part Of
VCU Theses and Dissertations
Date of Submission
4-20-2026