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

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 Proc...

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Bibliographic Details
Main Authors: Stetson, P.F., Jensen, J.A.
Format: Conference Proceeding
Language:English
Subjects:
Arteries
Blood flow
Displays
Filters
Frequency
Lattices
Real time systems
Recursive estimation
Scattering
Ultrasonic imaging
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Summary: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.
ISSN:1051-0117
DOI:10.1109/ULTSYM.1997.661807