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Accuracy of Electron Monte Carlo Dose Calculations

L Vazquez1*, C Huerta Hernandez2, O Calvo3, S Oddiraju4, (1) Piedmont Health Care,Atlanta, GA, (2) GRP, Temple, TX, (3) Advanced Physics Solutions, San Antonio, TX, (4) Baylor Scott and White Clinics, Round Rock, TX

Presentations

(Sunday, 7/12/2020)   [Eastern Time (GMT-4)]

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.

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Keywords

Electron Therapy, Monte Carlo, Dosimetry

Taxonomy

Not Applicable / None Entered.

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