The study derives and analyzes eight discrete time mean frequency estimators for multigated Doppler ultrasound, providing expressions for bias and variance and a method to exceed the Nyquist limit.
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May aid Doppler velocity estimation beyond Nyquist; leaves open empirical validation before clinical use.
Eight different discrete time mean frequency estimators for complex Doppler signals are derived and analyzed. The estimators are well suited for use in multigated Doppler ultrasound measurements of blood velocity profiles. Approximate expressions for bias and variance of the estimators are derived. A general scheme for extending the analyzing range of discrete time Doppler frequency estimators above the Nyquist limit is also outlined.
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Kristoffersen et al. (1985) studied this question.
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