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Fig. 1 | Cardiovascular Ultrasound

Fig. 1

From: Left ventricular high frame rate echo-particle image velocimetry: clinical application and comparison with conventional imaging

Fig. 1

Flow diagram of echoPIV processing. A two-angled diverging-wave pulse-inversion sequence is used at a pulse repetition frequency of 4900 Hz. Adjacent phase-inverted pulses are summed to suppress tissue clutter. The two angles are coherently summed to produce a BMode image; while block-wise normalized cross-correlation (bwNXCC) is performed between like angles to obtain the velocity vectors. After averaging 10 frames a single echoPIV frame is produced. Once all frames have been processed, the velocity field is regularized with spatial and temporal smoothing. Borders of the LV endocardium were manually drawn to fit the end diastolic shape (echoPIV image, red-dashed lines, Additional file 1). (Additional file 1 = flow in a normal heart)

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Cardiovascular Ultrasound

ISSN: 1476-7120

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