Background Quantitative flow ratio (QFR) is a technology to evaluate the coronary stenosis
significance on 3-dimensional quantitative coronary angiography. The aim of this study is to …

… Quantitative flow ratio (QFR) is currently the angiography-based index with the largest
amount of evidence. Because QFR seeks to simulate the FFR value, the same thresholds apply. …

… Their results showed that with increasing stenosis severity the coronary flow ratio … index.
They assumed that this was because collateral flow was missed by measuring coronary flow …

… index of microvascular resistance (r 2 = 0.19; P < 0.0001), due largely to variation in the
measurement of flow … Fractional flow reserve (FFR) was defined as the ratio of distal coronary to …

… coronary physiological assessments (eg instantaneous wave-free ratio [iFR], fractional flow
… guided by a computational coronary physiology index (quantitative flow ratio, QFR) yields …

… To date, fractional flow reserve (FFR) has been regarded as a reference invasive
physiological index on the basis of large clinical data. A physiological index that does not require …

… C oronary flow reserve (CFR) is the index commonly used as a physiological alternative
to … (' CFR was definedas the ratio between maximal flow velocity at the peak effect of the …

… /or flow velocity measurement and several indices have been … physiological basis underlying
these clinically used indices … stenosis resistance index, HSR, defined as the ratio between …

… physiological evaluation during routine FFR measurement and define a new pathological
flow–… flow ratio to the resting flow, while the Y axis shows the distal to proximal (aortic) pressure …

… Notably, assessment of the physiological functions of ‘non-culprit’ vessels could help predict
… can be used as an index for total “physiological” atherosclerotic burden and identification of “…