Evaluating dose distributions of high dose rate 60 Co brachytherapy in an asymmetric tumor: A comparison of different designs of vaginal cylindrical applicators

The aim of this study is to evaluate organ-at-risk (OAR) doses obtained from different designs of intracavitary cylinder applicators during high-dose-rate (HDR) brachytherapy of an asymmetric vaginal tumor. Dose distributions around five cylinder applicators were obtained using the Geant4 toolkit. T...

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Bibliographic Details
Published in:Applied radiation and isotopes 2024-02, Vol.204, p.111124
Main Authors: Aloraibi, Hayder Adil, Siavashpour, Zahra, Ghorbani, Mahdi, Abtahi, Marzieh, Jassim, Hussam, Gholami, Somayeh
Format: Article
Language:English
Subjects:
Brachytherapy - methods
Female
Humans
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted - methods
Vaginal Neoplasms - radiotherapy
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Summary:The aim of this study is to evaluate organ-at-risk (OAR) doses obtained from different designs of intracavitary cylinder applicators during high-dose-rate (HDR) brachytherapy of an asymmetric vaginal tumor. Dose distributions around five cylinder applicators were obtained using the Geant4 toolkit. Three of these applicators are commercially available: single-channel, multi-channel, and shielded. Additionally, two proposed sub-configurations were evaluated: (I) a combination of the multichannel applicator with a central shield and (II) a dynamically modulated cylinder (DMC). The dose distributions of the proposed applicators were compared to those of the single-channel cylinder applicator. The results showed that using a cylindrical applicator with a higher degree of freedom in plan optimization can improve OAR, sparing up to 60% for the rectum and 20% for the bladder. In conclusion, this work suggests using a new design of a cylindrical applicator to enhance the therapeutic ratio of brachytherapy for asymmetric and irregularly shaped vaginal tumors.
ISSN:1872-9800