A REAL-TIME ULTRASOUND TIME-DOMAIN CORRELATION BLOOD FLOWMETER .2. PERFORMANCE AND EXPERIMENTAL-VERIFICATION

The theory and design of a real-time ultrasound time-domain correlatio n (UTDC) flowmeter employing a high-speed residue number system correl ator has been presented in Part I [4] of this work. Part II evaluates the performance of the flowmeter under various How conditions for diff erent correlation parameter settings. Previous work has incorporated a weighted-averaging scheme to estimate the flow velocity over a wide n umber of echo signal spacings. This research indicates that a linear a veraging of 50 adjacent echo signal pairs produces equivalent accuracy and precision at real-time processing speed as compared to previous n on-real time systems incorporating weighted averaging.