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Journal of Diagnostic Medical Sonography
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Doppler Physics and Instrumentation

A Review

W. R. Hedrick, PHD

Clinical Radiation Biophysics, Northeastern Ohio Universities College of Medicine, Rootstown, Ohio; Radiology Department, Aultman Hospital, 2600 Sixth Street, SW, Canton, OH 44710

D. L. Hykes, MS

Clinical Radiation Biophysics, Northeastern Ohio Universities College of Medicine, Rootstown, Ohio; Radiology Department, Aultman Hospital, Canton, Ohio

The physical principles of continuous-wave and pulsedwave Doppler as well as the processing methods to detect the direction of flow are reviewed. An overview of Doppler instrumentation, including duplex, zero crossing, range-gated, and color flow imaging detection systems is presented. The technique of spectral analysis is explained with multiple illustrative examples. Aliasing, which arises from the limited sampling rate of pulsed wave instruments, is discussed in detail.

Key Words: Doppler instrumentation • spectral analysis • aliasing

Journal of Diagnostic Medical Sonography, Vol. 4, No. 3, 109-120 (1988)
DOI: 10.1177/875647938800400301
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