Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1882498 | Physica Medica | 2014 | 10 Pages |
Abstract
Analysis of the spectral database showed that even though the general trends for both linacs (FFF/STD) were the same, there were crucial differences. In general, the relative changes between different conditions were smaller for FFF spectra. This was because of the higher component of low-energy photons of the FFF linac, which already lead to higher dose enhancement than for the STD linac (photon energies were more “uniformly” distributed for FFF spectra and henceforth their perturbation resulted in lesser relative changes). For out-of-field FFF spectra and split-IMRT fields the strongest enhancement were observed (â¼25 and â¼5 respectively). Different spectral scenarios lead to different dose enhancements, however, they scale with the higher effective-Z of the materials and were directly related to the lower range of the spectra (<200Â keV).
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
P. Tsiamas, E. Sajo, F. Cifter, K. Theodorou, C. Kappas, M. Makrigiorgos, K. Marcus, P. Zygmanski,