ESTRO 2025 - Abstract Book

S4099

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

ESTRO 2025

experience (p≤0.05). Previous experience with patient anxiety and depression (76.8%) was the most common factor positively affecting RTT/TR comfort levels. Lack of education (71.1%) was the most common factor negatively affecting RTT/TR comfort levels. The majority of RTTs/TRs (93.6%) reported they would benefit from further education in this area. Conclusion: With cancer incidence rising, it is likely the number of patients expressing anxiety and depression symptoms will also rise. RTTs/TRs felt more comfortable managing patient anxiety than depression. Those with more years of clinical experience felt more comfortable managing depression than those with fewer years’ of experience. Given the desire for further education expressed by RTTs/TRs, future research focusing on training in this area may benefit both RTTs/TRs and patients. References: 1. Global cancer burden growing, amidst mounting need for services. Saudi Med J [Internet]. 2024 [cited 2024 Nov 20];45(3):326–7. Available from: https://www.who.int/news/item/01-02-2024-global-cancer-burden-growing--amidst mounting-need-for-services 2. Fabian A, Rühle A, Domschikowski J, Trommer M, Wegen S, Becker J-N, et al. Psychosocial distress in cancer patients undergoing radiotherapy: a prospective national cohort of 1042 patients in Germany. J Cancer Res Clin Oncol. 2023;149(11):9017–24. Digital Poster The impact of upright and supine treatment positions on breathing volumes and chest surface motion Anthony L Criscuolo 1,2 , Sophie Boisbouvier 3 , David Cobben 4,5 , Michael Kissick 6,7 , Mark Ramtohul 8 , Gordon Sands 6 , Russell Thomas 1,2 , Tracy Underwood 6,9 1 Radiotherapy and Radiation Dosimetry, National Physical Laboratory, Teddington, United Kingdom. 2 School of Mathematics and Physics, University of Surrey, Guildford, United Kingdom. 3 Radiotherapy department, Centre Léon Bérard, Lyon, France. 4 The Clatterbridge Cancer Centre, The Clatterbridge Cancer Centre, Liverpool, United Kingdom. 5 Institute of Population Health, University of Liverpool, Liverpool, United Kingdom. 6 Leo Cancer Care, Leo Cancer Care, Crawley, United Kingdom. 7 Department of Medical Physics, University of Wisconsin - Madison, Madison, USA. 8 University Hospital Birmingham NHS Foundation Trust, University Hospital Birmingham NHS Foundation Trust, Birmingham, United Kingdom. 9 Department of Medical Physics and Biomedical Engineering, UCL, London, United Kingdom Purpose/Objective: Interest is growing in upright or gantry-less radiotherapy. However, more data is needed on the impact of the treatment position on breathing volume. This study assessed the impact of upright and supine treatment positions on breathing volumes, deep inspiration breath hold (DIBH) lengths, and chest surface motion. It also assessed the feasibility of using spirometry and/or surface guidance techniques together with DIBH for upright positioning. Material/Methods: After Research Ethics Committee approval, twenty-one healthy participants (10 male, 11 female, aged 22-66, no COPD or asthma) underwent pulmonary function tests (PFTs) in both upright and supine positions over two repeat sessions. The order was alternated to mitigate against possible bias stemming from practice or fatigue. A demonstration version of the treatment chair ‘Eve’ (Leo Cancer Care) positioned participants upright, with custom arm-raising supports mimicking breast, chest, or abdomen treatments. Supine positioning used a radiotherapy couch top and a Monarch Wingboard (CQ Medical). Keywords: Anxiety, Depression, Education 2779