ESTRO 2021 Abstract Book

S478

ESTRO 2021

Conclusion 96% of responding centers use offline APT for at least one tumor site. 70 % of centers would like to use APT for at least one additional site. Currently, no center uses online APT as efficient integrated workflows are missing. More research and development for integrated and efficient workflow is needed to bring it to clinical practice. Acknowledgement: The authors would like to thank all particle therapy centers that have answered the questionnaire. * Bertholet & Anastasi, RO 2020 OC-0615 Radiographer-led online image guided adaptive radiotherapy: A qualitative investigation E. Joyce 1 , H.A. McNair 1,2 , G. O'Gara 3 , M. Jackson 4 , B. Peet 5 , R.A. Huddart 2 , T. Wiseman 3 1 Royal Marsden Hospital, Radiotherapy, London, United Kingdom; 2 Institute of Cancer Research, Radiotherapy and Imaging, London, United Kingdom; 3 Royal Marsden Hospital, Health Research, London, United Kingdom; 4 St George's University of London, Radiography, London, United Kingdom; 5 Royal Marsden Hospital, Clinical Trials, London, United Kingdom Purpose or Objective Online MRI guided adaptive radiotherapy (MRIgRT) is resource intensive. To maintain and increase uptake, traditional roles and responsibilities may need refining. This novel study aims to provide an in-depth understanding and subsequent impact of the roles required to deliver MRIgRT.

Materials and Methods A purposive sampling approach was used to invite radiographers, clinicians and physicists from centres with