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Journal of Diagnostic Medical Sonography
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Autocorrelation Detection in Color Doppler Imaging

A Review

W. R. Hedrick, PhD

Radiology Department, Aultman Hospital, 2600 Sixth Street, S.W., Canton, OH 44710; St. Joseph Hospital and Health Center, Lorain, Ohio; Northeastern Ohio Universities College of Medicine, Rootstown, Ohio.

D. L. Hykes, PhD

Radiology Departments of Aultman Hospital, Canton, Ohio; St. Joseph Hospital and Health Center, Lorain, Ohio; Northeastern Ohio Universities College of Medicine, Rootstown, Ohio.

Autocorrelation is the most common method used to estimate velocity in color flow imaging. Measurement of reflector velocity is obtained by manipulating the echo-induced signals generated from consecutive transmitted pulses. The processing steps in autocorrelation, including quadrature detection, gating, fixed echo cancellation, and mean frequency calculation, are discussed. Aliasing, which arises from limited sampling rate of pulsed wave instruments, is described.

Key Words: autocorrelation • mean frequency • color Doppler imaging • quadrature detection • fixed echo canceller • aliasing

Journal of Diagnostic Medical Sonography, Vol. 11, No. 1, 16-22 (1995)
DOI: 10.1177/875647939501100104
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