RT Journal Article
T1 A source model for the electron contamination of clinical linac heads in photon mode.
A1 González-Infantes, Wilfredo
A1 Anguiano, Marta
A1 Lallena, Antonio
K1 Aceleradores lineales
K1 Electrones
AB In this work a general source model has been developed to describe theelectron contamination in clinical linac heads when operating in photon mode. Themodel includes two-sources that take into account the electrons generated in the linachead and in the air gap between the linac head and the patient. Their geometricalcharacteristics are determined by fitting the model of total fluence distribution to aset of fluence data in air just before entering the water phantom and for various fieldsizes up to 40 × 40 cm2. The electron energy distributions are fitted to those obtainedfrom phase-space files calculated with PENELOPE at the patient surface and for thelargest field size. To verify the model, percentage depth doses and transverse profiles inwater obtained from a Monte Carlo simulation performed with a complete and detailedlinac geometry are compared to those found with the source model. Six linacs (threeoperating at 6 MV, one at 15 MV and two at 18 MV) have been studied. A comparisonwith the results obtained with a single source model is also carried out. The two-sourcemodel proposed provides a reasonably good description of the dose absorbed in waterfor all irradiation fields considered. The largest differences occur at the entrance ofthe phantom, for the low energy configurations and the smaller fields, reaching ∼ 15%at most. The two-source model describes much better than the single source one thelateral profiles in depth.
PB IOP
YR 2015
FD 2015-07-30
LK https://hdl.handle.net/10630/37131
UL https://hdl.handle.net/10630/37131
LA eng
NO W González et al 2015 Biomed. Phys. Eng. Express 1 025202
NO https://publishingsupport.iopscience.iop.org/questions/what-is-iop-publishings-green-open-access-policy/
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026