Isomorphism between pulsed-wave Doppler ultrasound anddirection-of-arrival estimation. II. Experimental results

摘要

For pt. I see ibid., vol. 43, no. 5, p. 911-22 (1996). Pt. Inpresented the basic principles for applying high-resolution wide-bandndirection-of-arrival estimation techniques to pulsed-wave Dopplernultrasound. Such techniques provide high-resolution velocity profilesnand enable the identification of multiple velocity components inside ansample volume. Another important application is the identification andnrejection of wall clutter signals. A first and essential step innapplying these techniques is to convert the wide-band echoes to narrownband. The 2D DFT projection method is used for this conversion. Twondifferent narrow-band high-resolution methods are then applied tonestimate the velocity distributions; the minimum variance (MV) and thenmultiple signal classification (MUSIC). Experimental results arenpresented to illustrate the potentials and limitations of applyingnwide-band DOA methods to different applications in pulsed-wave Dopplernultrasound