RT Journal Article
T1 Monte Carlo simulation of the dynamic micro-multileaf collimator of a LINAC Elekta Precise using PENELOPE.
A1 González-Infantes, Wilfredo
A1 Lallena, Antonio
A1 Alfonso, Rodolfo
K1 Montecarlo, Método de
K1 Aceleradores lineales
AB Micro-multileaf collimators are devices that are added to LINAC heads forstereotactic radiosurgery. In this work, the performance of an Elekta Precise LINAC,with a dynamic micro-multileaf collimator manufactured by 3D-Line has been studied.Monte Carlo simulations based on PENELOPE code and measurements with threedifferent detectors (PTW Semiflex 31010 chamber, PTW PinPoint 31016 chamber andPTW Diode 60008) have been carried out. Simulations were tuned by reproducingthe experimental TPR20,10 quality index, providing a nice description of both thePDD curve and the transverse profiles at two depths measured. The geometry of themicro-multileaf collimator was tested by calculating the transmission through it and itwas needed to reduce significantly the leaf separation indicated by the manufacturer toreproduce the experimental results. An approximate simulation in which the transportof the particles traversing the dynamic micro-multileaf collimator was described in asimplified way was analyzed, providing a good agreement with the full simulations.With the MC model fixed, output factors for various field sizes were calculated andcompared to the experimental ones, obtaining a good agreement. PDDs and transverseprofiles at two depths measured with the diode for small fields were well reproducedby the simulation, while the measurements performed with the PinPoint chambershowed differences in the PDDs, at large depths, and in the transverse profiles, at thepenumbra. Monte Carlo simulations and Semiflex and diode measurements, performedfor a 7.0 cm×7.0 cm field, were in nice agreement, while those obtained with thePinPoint chamber showed differences that increased with the depth in water. Atthe phantom entrance, all measurements showed non-negligible differences what madeMonte Carlo a good option to estimate the absorbed dose in this region.
PB IOP
YR 2011
FD 2011-05-13
LK https://hdl.handle.net/10630/37130
UL https://hdl.handle.net/10630/37130
LA eng
NO Phys. Med. Biol. 2011. 56 3417
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