Ultrasonic Doppler flow measurement system with tissue motion di

Details Ultrasonic Doppler flow measurement system with tissue motion di Ultrasonic Doppler flow measurement system with tissue motion di

1990-10-12

1993-03-30

Jaworski, Francis

Surgery

Truss

Pad

12866005, 12866006, 12866201, A61B 800

Patent

active

051974770

ABSTRACT:
An ultrasonic diagnostic system for measuring fluid flow velocities through Doppler techniques is provided which eliminates the effects of tissue motion from fluid flow velocity information. In a preferred embodiment Doppler information signal are discriminated to determine the presence of signal components resulting from moving tissue, which signal components are located at frequencies of a Doppler spectrum other than the predetermined frequency location of stationary tissue signals. The tissue motion signal components present are shifted to the predetermined frequency location and removed by high pass filtering the Doppler signals. The remaining signals are then shifted back to their original frequency location and transmitted to a Doppler velocity estimator for further processing of the fluid flow velocity information and ultimate display of the information. To overcome problems of Doppler frequency inaccuracies at discrete spatial positions, the Doppler signals from a plurality of neighboring spatial locations are examined in the aggregate to determine the frequency location of tissue motion signal components.

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