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Figure 1 Automated method of determining flow propagation velocity (v_p). A color M-mode Doppler image obtained by transesophageal echocardiography is shown at the left. The value of each color pixel is decoded. The maximum velocity value obtained during early filling (E) is detected. Isovelocity lines connecting pixels that encode values of 25% (yellow line), 50% (red line), 75% (green line) and 100% (blue line) of the maximum value are displayed in the right panel. The slope of the 50% isovelocity line is then determined. See text for details.