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Background: Treatment planning systems (TPSs) are used for dose calculations  in dose delivery by after loading brachytherapy machines. Such planning  systems usually use simplified algorithms in their dose calculations.  Verification of dose distributions produced by TPS is of clinical importance  and is part of a quality assurance program. In this study, the dose  distributions generated by GZP6 TPS for two GZP6 sources were verified.  Methods: The evaluation was based on the inter comparisons between the  isodose curves obtained through Monte Carlo simulations, radiochromic film  measurements, and GZP6 treatment planning system. MCNPX Monte Carlo code was  used to simulate the sources. Dose measurements were performed in a perspex  phantom using Gafchromic® EBT radiochromic films. Comparisons between the  results obtained from MC, RCF, and TPS were performed by gamma function  calculations with 5% dose/2 mm distance criterion. Results: Based on gamma  calculations our results showed that there was good agreement between the  dose distributions obtained by the three aforementioned methods in both  transverse and longitudinal planes for the GZP6 source No.2. However, for  source No. 5, the agreement was good in the transverse plane but it was low  in the longitudinal plane. Conclusion: The results showed that dose  distributions certified by the GZP6 TPS for the GZP6 source No. 2 were  validated. However, for source No. 5 some discrepancies were observed.  Accurate knowledge of the activity of each active pellet in the source No. 5  can clarify the cause of the discrepancies

Dose distribution verification for GZP6 sources: A comparison of Monte Carlo, radiochromic film, and GZP6 treatment planning system