B160 Figure 2 Results The pre-intervention survey revealed; only 30% of respondents thought the manual calculations were easy to perform, 70% of respondents calculations took up to 5 minutes to complete with 50% using pen and paper and 100% using a phone calculator. Following the app pilot; 100% of users reported that it made calculations easier and were confident that it would reduce errors. Increased efficiency was observed with 75% of users reporting using the app took <1 minute. All users reported high levels of trust in results obtained from the app. Conclusions Using a plan-do-study-act approach we built an app that local clinician-testers report makes dose calculation easier and quicker compared to their usual practice for our local HVLIA protocols. To complete the act phase we will need to conduct a formal local trial, and seek approval of the app's medical device status.

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