In our study, we have also calculated surface dose and electron fluence spectra for MLC and jaw define fields. Photon spectra and photon average energy distributions are found to be substantially modified by MLC as it removes lower-energy photons resulting in increase of PDDs for MLC blocked fields in comparison to the jaw define open fields. A significant increase in MLC leakage with increase in field size has been observed in our study. We also calculated the effect of MLC on percentage depth dose characteristics, photon spectra and photon average energy distributions. We have used Monte Carlo simulation model to calculate radiation leakage as a function of field size for Varian 120-leaf MLC by accurate modelling of the complex geometry of MLC. In this study, the BEAMnrc Monte Carlo code is used to investigate the characteristics of radiation transported through multileaf collimators (MLC) for 6 MV photon beam produced by Varian linear accelerator.
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