Figure 1b:

(a) Interpretation of FFR_CT results in a 65-year-old woman with typical angina. Agatston score, 333. Left: Coronary CT angiography curved multiplanar reconstructions demonstrate a 50%–69% proximal left anterior descending artery (LAD) stenosis (red arrow) and in the mid-LAD, nonobstructive diffuse disease. The blue arrow indicates where the lesion-specific FFR_CT value was assessed. Right: In the FFR_CT three-dimensional model, the FFR_CT value 16 mm distal to the stenosis was 0.85, indicating that the lesion did not cause significant pressure loss. However, FFR_CT was significantly low (0.76) in the terminal vessel segments. (b) Interpretation of FFR_CT results in a 63-year-old man with atypical angina. Agatston score, 245. Left: Coronary CT angiographic images demonstrate a 50%–69% proximal LAD stenosis (red arrow). The blue arrow indicates where the lesion-specific FFR_CT value was assessed. Right: In the FFR_CT three-dimensional model, the FFR_CT value 14 mm distal to the stenosis indicated that the lesion was hemodynamically significant with a value of 0.69. Coronary CT angiography and FFR_CT reporting are demonstrated in Figure 4. LCX = left circumflex coronary artery, RCA = right coronary artery.