Review question: What non-invasive cardiovascular imaging tests (SPECT, Stress Echo [SE], Cardiovascular Magnetic Resonance [CMR], CT Perfusion [CTP] and PET myocardial perfusion) have the best diagnostic accuracy to detect obstructive coronary artery disease using four different cutoffs, two anatomic (invasive coronary angiography) and two functional (invasive fractional flow reserve)? Which non-invasive cardiovascular imaging tests (SPECT, Stress Echo, CMR, CTP and PET myocardial perfusion) have the least bias and heterogeneity in their published data?