Method for adaptively filtering doppler signals using a complex

Details Method for adaptively filtering doppler signals using a complex Method for adaptively filtering doppler signals using a complex

1994-11-02

1995-08-29

Manuel, George

Surgery

Truss

Pad

A61B 800

Patent

active

054451566

ABSTRACT:
A time domain technique for implementing an adaptive wall filter improves imaging of low-velocity blood flow by removing signals associated with slowly moving tissue. Adaptive wall filtering is performed by estimating wall velocity and bandwidth, and then filtering the basebanded data with a complex time domain notch filter. The wall velocity estimate determines the center frequency of a wall signal while the wall variance estimate determines the wall signal bandwidth. The complex filter coefficients selected are those which will center the complex notch filter on the wall center frequency, and which will set the filter cutoff frequencies (measured from this center frequency) to match the wall signal bandwidth.

REFERENCES:
patent: 5186177 (1993-02-01), O'Donnell et al.
patent: 5349524 (1994-09-01), Daft et al.
patent: 5357965 (1994-10-01), Hall et al.
Kasai et al., "Real-Time Two-Dimensional Blood Flow Imaging Using an Autocorrelation Technique", IEEE Transactions on Sonics and Ultrasonics, vol. SU-32, No. 3, May 1985, pp. 458-463.

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