Inclusion Criteria:  Refered for myocardial perfusion imaging by O15-H2O PET at Department of Nuclear Medicine & PET Centre, Aarhus University Hospital > 18 years of age  Exclusion Criteria:  Allergic to adenosine Allergic to gadolinium Pregnancy Claustrophobia Severe Asthma Pacemaker or other ferro-magnetic implants GFR < 30