title: Estimation of the focal spot size and shape for a medical linear accelerator by Monte Carlo simulation.
abstract: The focal spot size and shape of a medical linac are important parameters that determine the dose profiles, especially in the penumbral region. A relationship between the focal spot size and the dose profile penumbra has been studied and established from simulation results of the EGSnrc Monte Carlo code. A simple method is proposed to estimate the size and the shape of a linac's focal spot from the measured dose profile data.
authors: Department of Physics, Laurentian University, Sudbury, Ontario, Canada P3E 2C5. lwang@physics.carleton.ca
authors: Lilie L W
authors: LL
authors: Wang
authors: Konrad
authors: K
authors: Leszczynski
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D008954:Models, Biological; D009010:Monte Carlo Method; D010315:Particle Accelerators; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D020266:Radiotherapy, Conformal / Q000379:methods*; D012062:Relative Biological Effectiveness; D012542:Scattering, Radiation