Fig. 12.

(a) A B-mode image from the left carotid artery of a healthy 23-year-old male volunteer is illustrated, with the red, dotted line marking the line of interrogation for acquired M-mode data. (b) Sample RF data after either a bandpass filtering (left) or complex PCF (right) is illustrated. (c) Estimated velocity profiles are shown for either bandpass or complex PCF technique. The red, dotted lines indicate the location of proximal and distal vessel walls. (d) Average decorrelation between consecutive echoes (average N to N−1 decorrelation) versus interrogation depth are illustrated, with red, dotted lines indicating the proximal and distal vessel walls.