Dose verification in brachytherapy by independent software
Keywords:
Brachytherapy, Treatment Planning System, Independent softwareAbstract
Background: Brachytherapy is a treatment method that delivers radiation directly into a specific site of the patient. It is necessary to control the quality of the Treatment Planning System and verify calculations using independent software to prevent errors that may occur in the planning.
Objective: To verify the radiation dose calculation at the reference point calculated from the treatment planning system compared to the independent software in cancer patients receiving brachytherapy. In addition, it also determined the benchmark for confidence limit in radiation dose calculation.
Materials and Methods: The Mobius Brachy independent software calibration was performed with IBA FC65-P Ionization Chamber 0.6 cc. The verification of the radiation dose calculation was performed by using the Oncentra MasterPlan version 4.5.3 treatment planning system compared with the independent software. This investigation is a retrospective study. The data were collected from patients receiving cancer treatment. The patients who were chosen as a sample group must use a defined type of applicator in the planning: Vaginal cylinder, Utrecht interstitial, and Fletcher for the total of 569 plans. The data were divided into groups following the type of applicator for finding the statistical values: maximum value, minimum value, average, and standard deviation. Then generate a confidence limit for use in an institution.
Results: The Mobius Brachy independent software demonstrated its results in the 0-percentage difference of calculated point doses compared with the ionization chamber. In verification of dose calculation, the results revealed that the Vaginal cylinder was -2.42%, the Utrecht interstitial was -1.07%, the Fletcher was -2.47% and all planning is -1.64%. The corresponding confidence limits were 4.44%, 5.32%, 3.27%, 5.31%, respectively.
Conclusion: The accuracy of radiation dose calculation at the reference point calculated from the treatment planning system compared to the independent software was within the range of ± 3%, and the overall confidence limit for the workers was not exceed 6%.
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