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Figure 1 Image Acquisition and Readout for FMD Using B-ED and A-WT

(A) B-mode ultrasound image of the brachial artery, with region-of-interest box for edge detection diameter measurement. (B) Flow-mediated dilation (FMD) using B-mode edge detection (B-ED). (C) B-mode image with perpendicular M-line for A-mode wall tracking (A-WT). (D) A-mode wall tracking output. (Upper trace) A-mode radio-frequency signal. (Middle trace) Anterior and posterior wall motion. (Lower trace) Distension waveform generating end-diastolic diameter. AUC = area under the curve.