ESTRO 2025 - Abstract Book

S358

Brachytherapy - Physics

ESTRO 2025

Keywords: treatment planning, BRIGHT, breast

References: [1] Dickhoff, L. R., Scholman, R. J., Barten, D. L., Kerkhof, E. M., Roorda, J. J., Bouter, A., Velema, L. A., Stalpers, L. J. A., Pieters, B. R., Bosman, P. A. N, Alderliesten, T. (2024). Keeping your best options open with AI-based treatment planning in prostate and cervix brachytherapy. Brachytherapy .

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Digital Poster Investigation of ocular shielding effectiveness in brachytherapy head and neck treatments Angeliki Gkavonatsiou 1 , Freja Alpsten 1,2 , Maria Persson 2 , Åsa CarlssonTedgren 1,2,3 1 Oncology Pahtology, Karolinska Institute, Stockholm, Sweden. 2 Nuclear Medicine and medical physics, Karolinska University hospital, Stockholm, Sweden. 3 Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden Purpose/Objective: There is an increased interest in use of contact brachytherapy to treat skin cancer occurring in the facial region. An implant in the facial region will contribute dose to the eye. Photons contributing dose to the eye are both primary photons from the source (entering the eye from the outside air) and photons scattered inside the patient reaching the eye. Previous unpublished MC study in our group showed no significant gain using lead shielding on the eye lenses for interstitial nose treatment. This finding coupled with results of Candela-Juan et. al. on contribution of characteristic x-rays from lead initiated this work. The aim is to study the effectiveness of ocular lead shields in brachytherapy treatments in the head and neck region.