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Monte Carlo Simulation of Electron Beams produced by LIAC Intraoperative Radiation Therapy Accelerator
M Robatjazi1, K Tanha2, S R Mahdavi3
1Medical Physics and Radiological Sciences Department, Sabzevar University of Medical Sciences, Sabzevar, Iran.
Journal of Biomedical Physics & Engineering
|May 8, 2018
Summary
Monte Carlo simulations accurately determined the dosimetric characteristics of electron beams from the LIAC accelerator. This research enhances the precision of intraoperative radiotherapy beam dosimetry.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Accurate dosimetry of electron beams from dedicated intraoperative radiotherapy (IORT) accelerators is challenging.
- Monte Carlo simulations offer a method to improve beam dosimetry accuracy for IORT accelerators.
Purpose of the Study:
- To model the LIAC accelerator head and electron beams using Monte Carlo simulations.
- To analyze the dosimetric characteristics of electron beams across various applicators and energies.
Main Methods:
- The LIAC accelerator head was modeled using the BEAMnrc Monte Carlo simulation system.
- Phase-space files were generated and used as input for DOSXYZnrc and BEAMDP codes for dose calculations.
Main Results:
- Monte Carlo results closely matched experimental measurements.
- Electron beam energy decreased with smaller applicator diameters.
- X-ray contamination increased with larger applicator diameters.
Conclusions:
- The LIAC head and PMMA collimator system produce electron beams with unique dosimetric properties.
- This specialized design is suitable for intraoperative radiotherapy applications.
- Monte Carlo simulations are valuable for characterizing IORT accelerator beams.
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