Ultrasonic doppler imager having an adaptive tissue rejection fi

Details Ultrasonic doppler imager having an adaptive tissue rejection fi Ultrasonic doppler imager having an adaptive tissue rejection fi

1994-12-29

1997-09-09

Jaworski, Francis

Surgery

Truss

Pad

A61B 806

Patent

active

056645759

ABSTRACT:
An ultrasonic Doppler flow (i.e. blood) imaging and/or measuring system capable of adaptively suppressing stationary or slowly-moving non-flow (i.e. tissue) signals having variable spectra from recovered ultrasonic echoes. In accordance with the invention, the tissue signals are suppressed using a tissue rejection filter having an attenuation characteristic which is controllably shaped based upon measured estimates of at least one spectral characteristic of the tissue signals to be removed, thereby maximizing the rejection of tissue movement signals and minimizing undesired attenuation of the blood flow signals. In accordance with one embodiment of the invention, the tissue rejection filter is embodied as a complex notch filter for filtering the baseband components of the recovered ultrasonic echoes, which filter has a variable notch shape and position as adaptively determined in response to changes in estimates of the spectral components of the tissue signal portion of the recovered echoes.

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