Grant Alexander Bateman1,2, Alexander Robert Bateman3. 1. Department of Medical Imaging, John Hunter Hospital, Locked Bag 1, Newcastle Region Mail Center, Newcastle, NSW, 2310, Australia. grant.bateman@health.nsw.gov.au. 2. Newcastle University Faculty of Health, Callaghan Campus, Newcastle, NSW, Australia. grant.bateman@health.nsw.gov.au. 3. School of Mechanical Engineering, University of New South Wales, Sydney, NSW, Australia.