Figure 1.

Flow chart showing the process of literature search and selection algorithm. A total of 23 studies were selected. Of note, there are studies that investigated multiple imaging modalities. FFR, fractional flow reserve; CTP, computed tomography perfusion; PET, positron emission tomography; CT-TAG, CT-derived transluminal attenuation gradient; CCTA, coronary computed tomography angiography; FFR_CT, computed fractional flow reserve derived from CCTA; ICA, invasive coronary angiography; SPECT, single-photon emission computed tomography; SE, stress echocardiography; MRI, magnetic resonance imaging.