ESTRO 2025 - Abstract Book

S4138

RTT - Patient care, preparation, immobilisation and IGRT verification protocols

ESTRO 2025

Conclusion: The use of bite block has a significant impact on deviation absolute values, showing a higher accuracy on patient’s positioning.

Keywords: Brain, immobilisation, SRS

References: Krieger, A., & Finkelstein, J. (2020). Advancements in Real-Time Monitoring for Stereotactic Radiosurgery. Journal of Radiation Oncology, 18(2), 202-210. https://doi.org/10.1007/s11523-020-00702-2 D'Arco, F., Celli, A., & Cattaneo, G. M. (2018). Cone Beam Computed Tomography for Stereotactic Radiosurgery: A Review of the Literature. Current Oncology Reports, 20(9), 74. https://doi.org/10.1007/s11912-018-0730-1 O'Brien, R., & D'Angelo, R. (2017). Impact of Immobilization Techniques on Stereotactic Radiosurgery Outcomes. Stereotactic and Functional Neurosurgery, 95(2), 81-89. https://doi.org/10.1159/000458037

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Digital Poster Revolutionising 3D Printing for lead mask production for radiotherapy for non-melanoma skin cancers on the face juliette valentine, Romaana Mir, Liam Cella, Guido Alzetta, David R Williams, George Kirby, Jack Hills, James Burnley Cancer Centre, Mount Vernon Hospital, London, United Kingdom Purpose/Objective: Non-melanoma skin cancers (NMSC) predominantly develop on sun exposed areas of the nose, nasal alar, and inner canthi, presenting unique challenges for radiotherapy due to their complex contours and proximity to critical structures. Custom-made lead masks are applied during electron radiotherapy to precisely target the cancer while protecting normal tissues. Traditionally, the production of lead masks involves plaster of paris and alginate impressions of the face; this production process is time-consuming requiring two visits lasting on average 75 minutes, prone to error from inaccuracies in alginate transfer, and can be physically uncomfortable for this often-older patient population.

Here we report implementation of a novel 3D printing process which has improved workflow, precision, and patient experience.

Material/Methods:

Since January 2024 33 patients underwent the 3D print pathway and electron radiotherapy planning: 27 nose, 4 cheek/inner-canthus, and 2 temples.