The Effect of Bladder Volume on Three-dimensional Vaginal Cuff Brachytherapy Planning
Sümerya Duru BİRGİ1,Ozan Cem GÜLER2,Yunus BABAYİĞİT1,Yakup ARSLAN1,Serap AKYÜREK1
1Department of Radiation Oncology, Ankara University Faculty of Medicine, Ankara-Türkiye
2Department of Radiation Oncology, Adana Başkent University Hospital, Adana-Türkiye
DOI : 10.5505/tjo.2023.4214 OBJECTIVE
We aimed to determine the effect of a Foley catheter on bladder fullness and the changes in the doses received by other critical organs (OAR) and target volumes during high-dose rate vaginal cuff brachytherapy (HDR-VBT) with an empty bladder.

Twenty patients with a diagnosis of endometrial or cervical cancer underwent post-operative three-dimensional HDR-VBT between January 2020 and May 2021 and were examined dosimetrically. After the evacuation of the urine, two simulation CT scans and plans were performed with and without inserting a Foley catheter. For both plans, the volumes and doses of HRCTV and each critical organ were recorded separately.

The median age of the patients was 60 years (35?79). HDR-VBT was applied to 16 patients with endometrial cancer and 4 patients with cervical cancer diagnosis. Median 50.4 Gy (45?50.4 Gy) external RT was administered to 12 patients with a total of 15 Gy BRT boost in 3 fractions. A total of 27.5 Gy HDR-VBT in 5 fractions were administered to 8 endometrial cancer patients. No significant difference was found regarding target and critical organ volumes between the two plans with or without a Foley catheter. Also, no statistically significant difference was detected in terms of target doses such as D90, D95, and D98 of HRCTV and D0.1, D1, D2cc, and mean doses of critical organs.

It seems simulating and treating the patient by just emptying the urine and using the decay and treat method is sufficient in terms of OAR and HRCTV dose limits. Keywords : Bladder; brachytherapy; cervical cancer; endometrial cancer