ESTRO 2025 - Abstract Book

S287

Brachytherapy - Gynaecology

ESTRO 2025

Conclusion: PLA and PETG serve as excellent materials for 3D printing in interstitial BQT, allowing for the customization of each applicator according to the individual anatomy of each patient. These thermoplastics own several advantages such as ease of fabrication, radiolucency and biocompatibility; however, they cannot withstand sterilization by heat due to their low thermal resistance. Silicone acetate, on the other hand, served as an ideal material for surface BQT owing to its durability, flexibility and softness, all this allowing no bubbles to be trapped between the treated surface and the material. Further evaluation of different materials is needed. References: 1.- Poltorak, M., Banatkiewicz, P., Poltorak, L., Sobolewski, P., Zimon, D., Szwast, M., & Walecka, I. (2024). Brachytherapy and 3D printing for skin cancer: A review paper. Journal of Contemporary Brachytherapy, 16(2), 156– 169. https://doi.org/10.5114/jcb.2024.137357 2.- Semeniuk, et al. (2021). Design and evaluation of 3D printable patient-specific applicators for gynecologic HDR brachytherapy. Med Phys, 48(7), 4053-4063. 3.- Lu, Y., Song, J., Yao, X., An, M., Shi, Q., & Huang, X. (2024). 3D printing polymer-based bolus used for radiotherapy. International Journal of Bioprinting, 7(4), 414. https://doi.org/10.18063/ijb.v7i4.414 Keywords: Brachytherapy, 3D printing, HDR