Dr Andrew Kelion qualified in medicine from Oxford in 1991, where he later trained in cardiology. He was Consultant Cardiologist and Director of Imaging at Harefield Hospital for 11 years, before returning to a consultant post at the John Radcliffe Hospital in Oxford in 2013. Dr Kelion subspecialises in noninvasive cardiac imaging, specifically echocardiography, nuclear cardiology and cardiac CT. He is well-known nationally as an educator in nuclear cardiology, and is a past President of the British Nuclear Cardiology Society. He has co-written many research papers, guideline documents and books, including the Oxford Handbooks of Nuclear Cardiology and Cardiovascular CT. Dr Parthiban Arumugam qualified in medicine from Madras, India; in 1991. He trained in the UK in medicine (1995) and nuclear medicine (1998) at Wigan and Manchester Royal Infirmary respectively. He has been working as a Nuclear Medicine Consultant at the Nuclear Medicine Center at Central Manchester University Teaching Hospitals NHS Foundation Trust since 2005. He is the Clinical Director of the department. Dr Arumugam's area of special interest is myocardial perfusion scintigraphy with SPECT, PET quantitative assessment of myocardial blood flow and FDG PET imaging for cardiovascular device infection. He is a past President of the British Nuclear Cardiology Society. He has co-authored publications in the field of cardiac PET, BNCS MPS guidelines, contributed to book chapters including An Atlas of Clinical Nuclear Medicine and for Cardiology Clinics of North America. Dr Nikant Sabharwal is a consultant cardiologist and head of the Nuclear Cardiology Department at the John Radcliffe Hospital, Oxford, UK. Dr Sabharwal trained in Oxford and London in cardiac imaging. He has specialist interests in nuclear cardiology, echocardiography and cardiac CT. He is a past president of the British Nuclear Cardiology Society and has published and lectured on nuclear cardiology.