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Monte Carlo simulation of surface percent depth dose
Sung-Yen Lin1, Tieh-Chi Chu, Jao-Perng Lin
1Department of Nuclear Science, National Tsing Hua University, Hsinchu, Taiwan, ROC.
Summary
This study simulated surface percent depth dose (PDDsurface) for 6 and 15 MV X-rays using Monte Carlo methods. Results provide crucial data for radiation therapy planning and quality assurance.
Area of Science:
- Medical Physics
- Radiation Oncology
- Computational Dosimetry
Background:
- Accurate surface dose calculation is vital for effective radiation therapy.
- Monte Carlo simulations offer high precision in modeling radiation transport.
- Understanding percent depth dose (PDDsurface) is essential for treatment planning.
Purpose of the Study:
- To determine the surface percent depth dose (PDDsurface) for 6 and 15 MV X-rays.
- To investigate the impact of field sizes (10x10 cm2 and 20x20 cm2) on PDDsurface.
- To validate simulation results against experimental measurements.
Main Methods:
- Utilized the OMEGA/BEAM code (an EGS4 user code) for Monte Carlo simulations.
- Accurately modeled the Siemens PRIMUS linear accelerator.
- Simulated dose distribution in a water phantom using generated phase space data.
Main Results:
- For 6 MV X-rays, PDDsurface values were 13.85±0.11% (10x10 cm2) and 23.21±0.20% (20x20 cm2).
- For 15 MV X-rays, PDDsurface values were 8.83±0.07% (10x10 cm2) and 18.60±0.12% (20x20 cm2).
- Simulation model was validated using ion chamber and CEA film measurements.
Conclusions:
- The study successfully simulated PDDsurface for different MV X-ray energies and field sizes.
- The findings contribute valuable data for optimizing radiation treatment plans.
- Monte Carlo simulation is a reliable tool for predicting surface dose in radiotherapy.