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Real-time blood flow estimation using a recursive least-squares lattice filter

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2 Author(s)
Stetson, P.F. ; Dept. of Inf. Technol., Tech. Univ., Lyngby, Denmark ; Jensen, J.A.

Ultrasonic flow estimation involves Fourier-transforming data from successive pulses. The standard periodogram spectral estimate does not reflect the true velocity distribution in the blood and assumes quasi-stationarity in the data. Last year (see J.A. Jensen et al., IEEE Ultrasonics Symposium Proceedings, p. 1221-4, 1996), the authors demonstrated that a recursive lattice filter can yield results much closer to the correct velocity distribution. They have now implemented it in real time on a system with sixteen ADSP-21060 processors, interfaced to a commercial scanner. The system can perform real-time processing for both the periodogram and lattice-filter approaches and displays both results on a PC for comparison. Results are shown for phantom data and for demodulated data from the aorta and hepatic vein of a healthy subject. This demonstrates under clinical conditions that the lattice filter gives a more realistic velocity distribution and can track rapid changes in the flow

Published in:

Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE  (Volume:2 )

Date of Conference:

5-8 Oct 1997