Dosimetric assessment of an air-filled balloon applicator in HDR vaginal cuff brachytherapy using the Monte Carlo method

Journal of Applied Clinical Medical Physics
Hongyu JiangDamodar Pokhrel

Abstract

As an alternative to cylindrical applicators, air-inflated balloon applicators have been introduced into high-dose-rate (HDR) vaginal cuff brachytherapy to achieve sufficient dose to the vagina mucosa as well as to spare organs at risk, mainly the rectum and bladder. Commercial treatment planning systems which employ formulae in the AAPM Task Group No. 43 (TG 43) report do not take into account tissue inhomogeneity. Consequently, the low-density air in a balloon applicator induces different doses delivered to the mucosa from planned by these planning systems. In this study, we investigated the dosimetric effects of the air in a balloon applicator using the Monte Carlo (MC) method. The thirteen-catheter Capri™ applicator by Varian™ for vaginal cuff brachytherapy was modeled together with the Ir-192 radioactive source for the microSelectron™ Digital (HDR-V3) afterloader by Elekta™ using the MCNP MC code. The validity of charged particle equilibrium (CPE) with an air balloon present was evaluated by comparing the kerma and the absorbed dose at various distances from the applicator surface. By comparing MC results with and without air cavity present, dosimetric effects of the air cavity were studied. Clinical patient cases with opt...Continue Reading

References

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Jan 24, 2012·Brachytherapy·William SmallUNKNOWN American Brachytherapy Society
Oct 23, 2014·Journal of Contemporary Brachytherapy·Ashraf HassounaCamelia Constantinescu

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Citations

Aug 13, 2021·Physics in Medicine and Biology·Hyojun ParkChul Hee Min

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Software Mentioned

Elekta
Oncentra [UNK]
Oncentra
MC
MCNP
Capri
Oncentra Brachy
Graphical

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