ESTRO 2020 Abstract book

S363 ESTRO 2020

The main lessons learnt were: Issues arise in all aspects of PoD and there was no improvement from the pre-trial to on-trial process. Thus, training is recommended before implementing PoD and monitoring its implementation is essential. Many issues can be avoided with checklists and improving guidance. Interactive sessions, i.e. workshops were successful for ongoing systematic issues across multiple centres; collaborating and improving compliance, e.g. in PoD selections. The concept of PoD needs to be realised e.g. if larger plans don’t encompass smaller plans or smaller plans are not optimised, the heavy workload to undertake PoD may be ineffective. The most common operative issues in two multicentre PoD trials have been outlined. In the era of adopting, adapting and advancing the lessons learnt suggest that simple processes can optimise the introduction of advanced techniques for all patients. OC-0591 Achieving expert consensus for IGRT training and assessment for radiation therapists: A Delphi T. Barnes 1 , S. Palmer 2 1 musgrove park hospital taunton, radiotherapy, taunton, United Kingdom ; 2 University of the West of England, Faculty of Health and Applied Sciences-, Bristol-, United Kingdom Purpose or Objective The aim of this Delphi study was to elicit expert radiation therapist (RTT) views related to image guided radiotherapy (IGRT) training and to gain consensus on optimal training, content and delivery methods. The objectives were to engage expert RTTs to disclose their thoughts on IGRT training content and delivery; to identify main themes, ideas and to gain consensus on the importance of each area highlighted; and to report a concise list of recommendations for key elements of IGRT training nationally in the UK. Material and Methods A three round modified Delphi was planned using online surveys to meet the study objectives. A purposive sample was used to meet inclusion criteria to ensure an expert panel of RTTs. Round one used semi-structured questions with open text. The data was analysed using content analysis. Statements and content were then sent to participants in round two, using Likert scales, rating statements on importance from 1-5 (Fig. 1). The consensus was accepted at 75% agreeance. Those statements that did not reach concordance in round two were re-presented in round three for arbitration.

Results 40 RTTs from the UK were recruited. Content analysis in round one highlighted nine themes: Staff acquiring and assessing images, Staff training and assessment, troubleshooting and Escalation, Layout of training, Delivery of Training, National Training, Content of training package, Time to train staff, and Competency. 126 statements gained 75% consensus or more. 30 Statements across the round two and three achieved 100% consensus. Including; “Trainees should be taught to detect trends in set up errors” and “Rotations into planning should start at undergraduate level”. 10 new statements derived from feedback in round two. In total 116 statements regarding IGRT training were deemed to gain consensus. Retention throughout the study was 90%. Conclusion To our knowledge this is the first known Delphi study to support the development of RTT IGRT training documentation and guidelines. The next step is to facilitate a national and international guideline for RTT training and assessment to improve IGRT practice. OC-0592 Implementation of MR-only one-day radiosurgery workflow for non-spinal bone metastases on MR-Linac M. Chamberlain 1 , S. Tanadini-Lang 1 , L. Wilke 1 , A. Moreira 1 , N. Weitkamp 1 , S. Ehrbar 1 , N. Andratschke 1 , M. Guckenberger 1 , H. Garicia Schüler 1 1 University Hospital Zürich, Department of Radiation Oncology, Zurich, Switzerland Purpose or Objective To implement a one-day on-table workflow on the MR- Linac (Viewray) without CT based planning for high dose (12/16Gy) radiosurgery of painful non-spinal bone metastases. Material and Methods Patients with painful bone metastases who were candidates for this treatment were consented and screened for MRI compatibility. The clinician prescribed one fraction of either 12Gy or 16Gy depending on the lesion size. In preparation, a dummy plan was created in