ESTRO 2025 - Abstract Book

S4367

RTT - Treatment planning, OAR and target definitions

ESTRO 2025

Conclusion: SPLS-IMRT is feasible, but achieving SP V26<30% remains challenging. 9F offers superior parotid sparing with minimal trade-offs, whereas VMAT underperformed in reducing parotid doses with increased doses to midline structures.

Keywords: parotid, xerostomia

References: 1 Huang, H., Miao, J., Xiao, X., Hu, J., Zhang, G., Peng, Y., Lu, S., Liang, Y., Huang, S., Han, F., Deng, X., Zhao, C., & Wang, L. (2022). Impact on xerostomia for nasopharyngeal carcinoma patients treated with superficial parotid lobe-sparing intensity-modulated radiation therapy (SPLS-IMRT): A prospective phase II randomized controlled study. Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology , 175 , 1–9. https://doi.org/10.1016/j.radonc.2022.07.006

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Digital Poster Rigid propagation of target structures facilitates RTT-led online adaptive radiotherapy (oART) of prostate and elective lymph nodes (Ethos/CBCT-based) Leslie D. Harrison, Kenneth F. Hofland, Thomas H. Johansen, Ahmad Kaouk, Mette M. Nielsen