Key result
Two-dimensional Fourier transform processing of broad-band pulsed Doppler ultrasound corrects aliasing in phantom experiments.
Why the study?
A unifying description of broad-band pulsed Doppler ultrasound processing using the two-dimensional Fourier transform is needed to address aliasing and spectral broadening effects.
The application of a two-dimensional Fourier transform to broad-band pulsed Doppler ultrasound data provides a unifying framework that can correct for aliasing.
Does not support clinical adoption of aliasing-corrected Doppler; leaves open in vivo validation for cardiovascular imaging.
Considering data from a Doppler sample volume as a two-dimensional function of depth and time, the properties of its two-dimensional fast Fourier transform (2DFFT) are discussed. It is shown that the 2DFFT of idealized Doppler data from moving scatterers is a line whose slope is the velocity of the scatterers. Aliasing, finite bandwidth effects, and spectral broadening due to transit time effects receive simple descriptions in this scheme. Existing processing schemes can be described graphically in this unifying description. Processing of broad band pulsed Doppler ultrasound can incorporate a correction for aliasing if based on the two-dimensional Fourier transform, and this has been tested using data from tissue-mimicking phantom in a tank-based experiment.
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Laurence S. Wilson (1991) studied this question. Two-dimensional fast Fourier transform (2DFFT) processing was evaluated on Correction for aliasing. Processing of broad-band pulsed Doppler ultrasound based on the two-dimensional Fourier transform can incorporate a correction for aliasing, as demonstrated in a tissue-mimicking phantom experiment.