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Figure 2 Correlation Between MPR and Quantitative Coronary Angiography

The myocardial perfusion reserve (MPR) data (left panel) are reported in graphics for individual slices of cardiac magnetic resonance (CMR) (S1 to S8; first graphic corresponding to left ventricle blood pool). Purple and green lines represent the fitting curves for rest and stress, respectively. The MPR values (Pr) are depicted for each slice at the bottom of each graphic. Rest and stress flow are also reported in the bar graph, with each bar corresponding to 1 CMR slice. Note that slice S4 shows an average MPR of 1.79, which corresponds to the left circumflex artery territory. Coronary angiography (middle bottom panel) revealed a 65% stenosis in the first obtuse marginal branch of the left circumflex artery, which had a fractional flow reserve of 0.65. Middle upper panel shows the middle CMR slides with the quantitative contours. Perfusion magnetic resonance imaging images at both stress and rest are shown in the right panels. It is important to note that the perfusion defect was not visualized in the stress image, and was only detected by the quantitative method. DS = diameter stenosis; FFR = fractional flow reserve.

Please see the Appendix for accompanying video.