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Estimation of the focal spot size and shape for a medical linear accelerator by Monte Carlo simulation
Lilie L W Wang1, Konrad Leszczynski
1Department of Physics, Laurentian University, Sudbury, Ontario, Canada P3E 2C5. lwang@physics.carleton.ca
Medical Physics
|March 29, 2007
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.
