Room: AAPM ePoster Library
Purpose: investigate the accuracy of the electron Monte Carlo dose calculations for irregular surfaces and comparison with traditional electron cut-out measurements.
Methods: dose verification was performed for several cases for which the dose agreement was more than 7% with electron monte carlo dose calculations. Electron cut-out measurements pre-treatment in a cubic phantom and in-vivo dosimetry measurements via diode or OSL measurements during the first fraction were performed in those scenarios. Monte Carlo dose calculations were compared against these measurements.
Results: studies were performed between the electron monte carlo dose calculations with in-vivo and electron cutout measurements for 10 clinical cases. Electron cut-out measurements agree with independent dose verification with an average percent dose difference of 1.5%. Monte Carlo calculations shows a percent dose difference of 10.4% with the independent dose verification. And comparison between Monte Carlo and electron cut-out measurements shows a percent dose difference of 9.8%. And finally Monte Carlo dose calculations were compared with in vivo measurements on the first fraction with an agreement of 3.1%.
Conclusion: work indicates the potential for significant time reduction in the electron dose verification for Medical Physicist when using an Electron Monte Carlo dose engine. Our results shows that there is a better estimation of the dose via electron Monte Carlo calculations than with the traditional cut-out measurements.
Electron Therapy, Monte Carlo, Dosimetry
Not Applicable / None Entered.