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Figure 2b: Example of perfusion measurement in a patient with a CFR of 1.7 in the right coronary artery. (a) Sequential cardiac MR images (2.2/1.1, 50° flip angle°) obtained with a short-axis view in the center section show the first pass of a bolus of contrast material during rest (top row) and stress (bottom row). A region of delayed contrast material inflow is identified by a dark area in the inferior and inferoseptal segments (arrowheads). (b) Signal intensity–time curves obtained in segment 5 at rest and stress show that the delayed contrast material inflow results in a reduced upslope during stress compared with rest. AU = arbitrary units, SI = signal intensity.
