1. Medical Physics Service, Castle Hill Hospital, Hull University Teaching Hospitals NHS Trust, Castle Road, Hull, HU16 5JQ, UK
2. Faculty of Science and Engineering, University of Hull, Cottingham Road, Hull, HU6 7RX, UK
3. Radiology Department, Castle Hill Hospital, Hull University Teaching Hospitals NHS Trust, Castle Road, Hull, HU16 5JQ, UK
4. Faculty of Health and Wellbeing, Sheffield Hallam University, City Campus, Howard Street, Sheffield, S1 1WB, UK