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Full-Text Articles in Physical Sciences and Mathematics
Design Of Electron Dual Foil Scattering Systems For Elekta Infinity Radiotherapy Accelerators, Justin Deloy Leblanc
Design Of Electron Dual Foil Scattering Systems For Elekta Infinity Radiotherapy Accelerators, Justin Deloy Leblanc
LSU Master's Theses
Purpose: To design a dual foil scattering system within Elekta Infinity radiotherapy accelerator constraints that results in clinical electron beams that meet flatness criteria of ±3% (±4%) along its principal axes (diagonal axes) for the 25x25cm2 applicator and most probable surface energies of 7-20 MeV (1 MeV increments). Methods: An analytical electron dual scattering foil system simulator was commissioned and verified using Monte Carlo (MC) simulations. Verification required comparing analytical simulator with MC-calculated electron fluence profiles for identical geometries: (1) only primary foil and (2) both primary and secondary foils in the beam. Also, simulator-calculated bremsstrahlung dose was validated by …
Utilization Of Machined Skin Collimation For Electron Therapy, Ryan Kenneth Posey
Utilization Of Machined Skin Collimation For Electron Therapy, Ryan Kenneth Posey
LSU Master's Theses
Purpose: Electron skin collimation (eSC) sharpens the penumbra, allowing electron radiotherapy of cancers while minimizing dose to adjacent normal tissue, e.g., protecting the eye in treating eyelid and nose cancers. This study assessed the clinical potential for milled brass eSCs to replace manually-fabricated lead or Cerrobend eSCs. Methods: Aim one was to measure the influence of eSC edge angle on the dose distributions, which were measured under edges of lead eSCs for combinations of three bevel (0°,±10°) and five gantry (0°,±3°,±5°) angles for a 6-MeV beam. Aim two was to validate the dimensional conformity of three machined brass eSCs, one …