A new ultrasonic flow measurement method using time-domain correlation of consecutive pairs of echoes has been developed. The time shift between a pair of range-gated echoes is determined by searching for the shift with the maximum correlation. This shift indicates the distance a group of scatterers has moved between pulses. The high precision and good resolution of the velocity estimate indicate that quantitative flow mapping is possible. Total flow through the vessel is calculated and compared to accurate hydrodynamic flow measurements in order to determine the overall experimental accuracy of the time-domain method.
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