Abstract
Beam modifiers, such as jaws, wedges, blocks, compensator, multi-leaf collimator (MLC), electron cutout and bolus need to be considered when the Monte Carlo method is applied to dose calculation in radiation therapy treatment planning. The most accurate method is to simulate particle transport in each beam modifier using the Monte Carlo method. The EGS4 [1] user code BEAM [2] was designed to perform treatment head simulations. Once the phase space data is obtained at the distal face of a beam modifier, another dose calculation tool, like DOSXYZ [3], is needed to perform the dose calculation in a phantom or a patient built from CT data. This two-step method works well but is not convenient. It requires additional time to perform the two-step simulation and large storage space for the temporary phase space data produced after the first step simulation. This is not suitable for routine clinical dose calculations. In this work we have implemented beam modifiers in an EGS4 user code called MCDOSE [4,5].
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