Program Information
Validation of the Monte Carlo Algorithm for Electrons in Treatment Planning
S Enright1*, A Asprinio2 , L Lu2 , (1) University of Miami, Coral Gables, FL, (2) South Florida Radiation Oncology, Stuart, FL
MO-B-Salon AB-11 Monday 10:00:00 AM - 12:00:00 PM Room: Salon ABPurpose: This study was conducted to validate the Monte Carlo algorithm for electron therapy in the Eclipse treatment planning system. Irradiation with electrons offers the advantages of dose uniformity in the target volume and in minimizing the dose to deeper healthy tissue. Using the Monte Carlo algorithm will improve dose accuracy in regions with heterogeneities.
Methods: Dose distributions from film measurements were compared to dose distributions from Electron Monte Carlo, and Pencil Beam algorithms in Eclipse. These measurements were obtained for 6MeV, 9MeV and 12MeV electrons. All phantoms studied were imported into Eclipse by CT scan. A 1 cm thick solid water template with one square and two circular holes for bone-like and lung-like plugs was used. Each configuration had either all bone or all lung plugs. Film measurements were taken at two depths for each energy. The depths used were the depth of maximum dose (dmax), and a depth greater than dmax. Ionization chamber measurements were also obtained at different locations and were used for comparison and to verify the film measurements.
Results: The accuracy of Electron Monte Carlo was compared to that of Pencil Beam. The dose from Monte Carlo agreed better than that from Pencil Beam for all configurations and depths. The pass rate for Monte Carlo was in the 80%-99% range, where the pass rate for Pencil Beam was as low as 10.76%. Ionization chamber measurements verified that the dose given from the film was accurate.
Conclusion: The dose distribution from Monte Carlo agreed much better with the measured dose from the film when compared to the Pencil Beam algorithm. The pass rates for Monte Carlo were significantly higher than those from Pencil Beam. Monte Carlo should be used over Pencil Beam for regions with heterogeneities.
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