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A Monte Carlo approach for small electron beam dosimetry
M Rincón1, F Sánchez-Doblado, M Perucha
1Departmento Fisiología Médica y Biofísica, Universidad de Sevilla, Facultad de Medicina, Avda. Sánchez Pizjuán 4, E41009 Seville, Spain.
Summary
Monte Carlo (MC) simulations offer a more accurate method for verifying dose calculations in radiation therapy, especially for small beam areas. This study highlights limitations in conventional dosimetry and planning systems for critical treatments.
Area of Science:
- Medical Physics
- Radiation Oncology
- Computational Dosimetry
Background:
- Conventional dosimetry and treatment planning may lack accuracy for treatments requiring small effective beam areas.
- Monte Carlo (MC) methods provide a potential alternative for verifying dose calculations in such critical scenarios.
Purpose of the Study:
- To evaluate the accuracy of Monte Carlo simulations compared to conventional methods for dose verification.
- To demonstrate the importance of independent assessment in critical radiotherapy situations using a case study.
Main Methods:
- Employed the BEAM program (based on EGS4 code) for electron beam simulation.
- Compared MC simulation results with film dosimetry.
- Obtained patient dose distribution using full Monte Carlo (FMC) simulation and a conventional planning system (PLATO).
Main Results:
- Observed discrepancies between film dosimetry and MC methods in profile comparisons.
- Found significant differences in patient isodose distribution between FMC simulation and conventional planning.
Conclusions:
- Conventional dosimetry and planning systems exhibit limitations when treating with small beams.
- An independent and more accurate assessment, such as MC simulation, is desirable for critical radiotherapy applications.