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Figure 3 Color Doppler flow mapping in the distal left anterior descending coronary artery (LAD) before (upper panel) and after contrast enhancement using, respectively, fundamental mode (midpanel) and harmonic mode (lower panel). A modified two-chamber view has been obtained. Before contrast infusion (upper panel) faint LAD flow (score 2) is detected by color Doppler in fundamental mode in the anterior groove area (epicardial side of the left ventricular anterior wall). After contrast infusion, blooming and flashing blur color flow Doppler signal from the LAD when fundamental Doppler is used (midpanel); switching to second harmonic (lower panel) color-coded blood flow in the LAD is clearly depicted (indicated by arrows). Enhancement of color Doppler signal in the left ventricular cavity is also evident. LV = left ventricle.