ESTRO 2025 - Abstract Book

S3340

Physics - Intra-fraction motion management and real-time adaptive radiotherapy

ESTRO 2025

Figure 1: (a) Geometric overlap (b) Dosimetric coverage of planning and pre-treatment target volumes

Conclusion: Despite the time required for the adaptive process, daily oART achieves robust geometric and dosimetric coverage with minimal internal margins (1-mm axial, 2-mm SI). This stability confirms the oncologic safety of such margins with oART for HNSCC, which allows for markedly smaller PTV volumes – and attendant dosimetric benefits – for both daily and stereotactic IMRT.

Keywords: Head and Neck, Adaptive Therapy, CBCT

References: International Journal of Radiation Oncology, Biology, Physics, Volume 117, Issue 4, e6

3980

Digital Poster Improving Setup Accuracy and Patient Comfort in SRS: Surface-Guided Radiotherapy with Open-Face Masks and Head Adjuster vs. Closed Masks sabrine meftah 1 , Ilyes Nefzi 2 , Hamza Jebali 2 , Narjess Chaari 3 , Adel Kallel 4 , Lotfi Kochbati 3 , Manel Braiek 5 , Hela Hammami 3 , Manel Jebsi 3 , Khadhraoui Amna 6 1 radiotherapy, ennasr clinic, tunis, Tunisia. 2 Medical Physicist, Ennasr Clinic, Aryanah, Tunisia. 3 Radiation Oncologist, Ennasr Clinic, Aryanah, Tunisia. 4 Radiation Oncologist, Abderrahmen Mami Hospital, Aryanah, Tunisia. 5 Radiation Therapist, Ennasr Clinic, Aryanah, Tunisia. 6 Medical Physics, Ennasr Clinic, Aryanah, Tunisia Purpose/Objective: The aim of this study is to assess the effectiveness of using AlignRT system with an open-face mask immobilization and head adjuster in enhancing setup accuracy, dosimetric constraints and patient comfort.