S57
Brachytherapy - Gynaecology
ESTRO 2026
Keywords: brachytherapy, chemoradiotherapy, cervical cancer References: Pötter R et al. Clin Transl Radiat Oncol. 2018;9(48- 60)Cordoba A et al. Front Oncol. 2024;14:1347727 Digital Poster Highlight 1683 Development of a Gynecologic Phantom for Simulation-Based Training in IC/IS Brachytherapy Through Collaboration Between Academia and Industry Noriko Ii 1 , Koji Masui 2 , Naoya Murakami 3 , Ken Yoshida 4 , Miho Watanabe 5 , Shin-ei Noda 6 , Hitoshi Ikushima 7 , Tatsuya Ohno 8 1 Radiation Oncology, Ise Red Cross Hospital, Mie, Japan. 2 Radiology, Kyoto Prefectural University of Medicine, Kyoto, Japan. 3 Radiation Oncology, Juntendo University Graduate School of Medicine, Tokyo, Japan. 4 Radiology, Kansai Medical University Medical Center, Osaka, Japan. 5 Diagnostic Radiology and Radiation Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan. 6 Radiation Oncology, Saitama Medical University International Medical Center, Saitama, Japan. 7 Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan. 8 Radiation Oncology, Gunma University Graduate School of Medicine, Gunma, Japan
imagingCompatibility with computed tomography (CT)/magnetic resonance imaging (MRI)-based treatment planning after needle insertionConstruction using soft yet durable materialsAnatomically accurate representation of perineal and vaginal structures.A prototype was fabricated and evaluated by radiation oncologists, followed by iterative refinements aimed at commercialization. Results:
The prototype phantom measured approximately 210 × 152 × 210 mm and weighed 4.5 kg. It was exhibited and evaluated at the 2024 Annual Meeting of the Group of Brachytherapy (Figure 1). Fifteen radiation oncologists participated in hands-on testing and completed a questionnaire. While the main limitation was the persistence of needle marks on TRUS/TAUS after needle removal, all other design requirements were successfully met. The phantom allowed for both transvaginal and transperineal needle insertion under ultrasound guidance and was suitable for post- insertion CT and MRI. To minimize needle-mark artifacts, the use of thinner metal needles is recommended for training purposes. Conclusion: Through close collaboration between academia and industry, we successfully developed a commercially available gynecologic phantom designed for simulation-based training in IC/IS brachytherapy. This innovation is expected to enhance the accessibility and quality of practical education in gynecologic brachytherapy. Keywords: Gynecologic phantom, Simulation-based training
Purpose/Objective: Simulation-based training has become a
transformative method in medical education and has been effectively applied in intracavitary/interstitial (IC/IS) brachytherapy for cervical cancer. In 2022, the Future Planning Subcommittee of the Group of Brachytherapy organized a hands-on seminar on IC/IS brachytherapy. As no gynecologic training phantom was available at that time, prostate phantoms were used for interstitial needle insertion. To address this gap, we initiated a collaborative project with a medical phantom manufacturing company to develop a commercially available gynecologic phantom suitable for IC/IS brachytherapy training. Material/Methods: The development team consisted of 8 radiation oncologists from the Future Planning Subcommittee, 10 collaborating radiation oncologists, 2 professional engineers, and 1 sales representative. Phantom specifications were discussed through email and online meetings. The key requirements were as follows:Compatibility with transvaginal and transperineal needle insertion approachesGuidance capability under transrectal (TRUS) and transabdominal (TAUS) ultrasound.Minimal residual needle artifacts on TRUS/TAUS after repeated insertionRealistic tumor simulation using TRUS/TAUS
Digital Poster 1915
High-Dose-Rate Versus Pulse-Dose-Rate Brachytherapy in Vulvovaginal Cancers: Comparison of Acute Toxicities Alizée Renan 1 , Renard Sophie 1 , Jean-François Py 1 , Claire Charra-Brunaud 1 , Sébastien Cambier 2 , Julia Salleron 2 , Marie Bruand 1
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