Author's summary
With recent advancements, fractional flow reserve (FFR) can be computed from coronary computed tomography angiography (CCTA). This study validated the diagnostic performance of the on-site automatic CCTA-derived FFR (CT-FFR) using a commercially available workstation to define ischemia-causing coronary artery disease (CAD). This on-site CT-FFR showed a diagnostic accuracy of 80.6%, a sensitivity of 88.1%, and a specificity of 75.6% to predict FFR ≤0.80. In addition, the diagnostic performance and discriminant ability of CT-FFR to predict FFR ≤0.80 were better than those of stenosis severity from CCTA. The current CT-FFR solution can provide useful information on the hemodynamic significance of CAD.