The primary objective of the study is to assess the diagnostic efficacy (specificity and sensitivity) of flurpiridaz F18 injection PET myocardial perfusion imaging (MPI) compared to single photon emission computed tomography (SPECT) MPI in the detection of significant coronary artery disease (CAD) as defined by invasive coronary angiography (ICA) or a documented history of Myocardial Infarction (MI).