Joseph C Lee1,2, David G Lyall3, Yong S Wee2,4. 1. Department of Medical Imaging, The Prince Charles Hospital, Brisbane, Queensland, Australia. 2. Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia. 3. School of Health Sciences, University of Newcastle, Newcastle, New South Wales, Australia. 4. Department of Cardiology, The Prince Charles Hospital, Brisbane, Queensland, Australia.