Assessment of Dose Calculation Accuracy of Monaco Treatment Planning System for Effective Wedge Angle in Internal Wedged Fields using Two Different Analytical Methods

Background: In radiotherapy, the accuracy of dose calculation systems plays a key role in the treatment of cancer patients.Objective: The current research aimed to evaluate the dose calculation accuracy of Monaco Treatment Planning System (TPS) in estimating the Effective Wedge Angle (EWA) using two different mathematical methods: Elekta formula and ICRU-۲۴ formula.Material and Methods: In this experimental study, EWAs for different field sizes (۵×۵, ۱۰×۱۰, ۱۵×۱۵, ۲۰×۲۰, ۲۵×۲۵, and ۳۰×۳۰ cm۲) at standard angles (۱۵°, ۳۰°, ۴۵°, and ۶۰°) were computed by the Monaco TPS using two different analytical methods. The practical EWAs were measured according to the conditions outlined in the Elekta formula and the ICRU-۲۴ formula, and these measurements were compared with the results derived from the TPS.Results: The planned and measured EWAs are consistent with the Elekta formula, and the error value was less than ±۰.۵ in all radiation fields and EWAs. In the ICRU-۲۴ formula, the maximum deviation was ±۲.۶° between the computational and practical EWAs. Conclusion: The Elekta-based analytical method demonstrates a good agreement between planned and measured EWAs, while the ICRU-۲۴ formula exhibited the greatest discrepancies.

کلیدواژه ها:

Radiometry ، Radiotherapy ، X-rays ، Internal Wedge ، Effective Wedge Angle ، Elekta Formula ، ICRU-۲۴ Formula