Multiple-source models for electron beams of a medical linear accelerator using BEAMDP computer code

Jabbari, N and Barati, A.H and Rahmatnejad, L (2012) Multiple-source models for electron beams of a medical linear accelerator using BEAMDP computer code. Reports of Practical Oncology and Radiotherapy, 17 (4). pp. 211-219.

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Abstract

The aim of this work was to develop multiple-source models for electron beams of the NEPTUN 10PC medical linear accelerator using the BEAMDP computer code. Background: One of the most accurate techniques of radiotherapy dose calculation is the Monte Carlo (MC) simulation of radiation transport, which requires detailed information of the beam in the form of a phase-space file. The computing time required to simulate the beam data and obtain phase-space files from a clinical accelerator is significant. Calculation of dose distributions using multiple-source models is an alternative method to phase-space data as direct input to the dose calculation system. Materials and methods: Monte Carlo simulation of accelerator head was done in which a record was kept of the particle phase-space regarding the details of the particle history. Multiple-source models were built from the phase-space files of Monte Carlo simulations. These simplified beam models were used to generate Monte Carlo dose calculations and to compare those calculations with phase-space data for electron beams. Results: Comparison of the measured and calculated dose distributions using the phasespace files and multiple-source models for three electron beam energies showed that the measured and calculated values match well each other throughout the curves. Conclusion: It was found that dose distributions calculated using both the multiple-source models and the phase-space data agree within 1.3%, demonstrating that the models can be used for dosimetry research purposes and dose calculations in radiotherapy

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