ESTRO 2022 - Abstract Book

S704

Abstract book

ESTRO 2022

mm). Three of the 5 patients had consistent GTV displacements of < 3mm. In the remaining two patients, shifts of 3.1 – 10.0 mm were demonstrated . Median GTV BeamOn D95% was 16.5 Gy for GTV-PTV (range: 5.5 – 18.9). For ITV-PTV, this was 17.7 Gy (range: 16.3 – 19.5). Median OAR doses were comparable between GTV-PTV and ITV-PTV. Urethra D10% was 10.6 Gy and 10.0 Gy, respectively; rectum D0.5cc 8.2 Gy and 9.2 Gy; and bladder D0.5cc 3.3 Gy and 3.5 Gy. Conclusion Variable intra-fraction shifts in GTV were found between patients, with resultant discrepancies in target coverage. The results suggest that generation of an ITV may allow for improved accuracy in GTV dose escalation on the MRL, whilst maintaining acceptable OAR dose constraints.

OC-0785 A training needs analysis for online MRI guided adaptive radiotherapy: UK therapeutic radiographers

E. Joyce 1 , H.A. McNair 2 , M.T. Jackson 3 , J. Skok 3 , B. Peet 4

1 Royal Marsden Hopsital, Radiotherapy, London, United Kingdom; 2 Royal Marsden Hospital, Radiotherapy, London, United Kingdom; 3 St George's, University of London, Diagnostic Radiography Section, London, United Kingdom; 4 Royal Marsden Hospital, Research Operations, London, United Kingdom Purpose or Objective Online MRI guided adaptive radiotherapy (MRIgRT) requires skills that UK therapeutic radiographers (TRs) may not have with conventional training and practice. A training needs analysis (TNA) was undertaken to explore this. Materials and Methods The TNA was developed based on previous investigations into skills required for MRIgRT. Invitations to take part in the TNA were sent via department emails and social media with the aim to reach every UK centre. It was not a requirement to be involved or have any experience in MRIgRT. Results A total of 261 responses were received from 77 UK centres (96% of NHS UK centres). Figure 1 shows the training needs for MRIgRT skills. Table 1 shows the TRs training aspects and views on the importance of MRIgRT skills. MRI Acquisition: Only 7% of TRs had training. 74% of TRs would like training or additional training as 1% reported training was sufficient. 36% reported that this skill was important to their current job and 82% indicated a future training need. CT-CT/CBCT Matching: 75% of TRs had training. 84% of TRs expressed it was important to their current role and 94% thought it was important to the future of the profession and 39% saw it as future training need. MRI-CBCT/MRI Matching: 11% of TRs had training in this skill. 43% of TRs stated it was important to their current job and 76% thought it was important to the future of the profession. Contouring on CT: 78% of TRs would like training or additional training as only 7% reported that training was sufficient. 56% of TRs thought it was important to their current role and 72% indicated there was future training need. Contouring on MRI: 3% of TRs had training in this skill. 65% reported they wanted training or additional training as only 2% said it was sufficient. 38% reported it was important to their current role and 82% thought it was important to the future of the profession. Radiotherapy planning: 30% of TRs had training in this skill. 68% of TRs would like training or additional training as only 9% reported that training was sufficient. 55% thought it was important to their current. 46% indicated a current training need and 72% indicated there was a future training need. Radiotherapy plan checking and approval: 16% of TRs had training in this skill. 58% of TRs would like training or additional training as only 7% stated training was sufficient. 48% stated it was important to their current role 64% highlighted a future training need.