Doppler Spectra for Stationary and Dynamic Ultrasonic Fields
Abstract
This paper presents a review of physical and methodological approaches to describing the spectrum of the ultrasonic Doppler signal in biological media. The results on the formation of spectral characteristics for a stationary probing field under different types of scatterer motion are summarized, and the development of the model for the case of a dynamically varying sensitivity function of the ultrasound system is considered. Particular attention is paid to synthetic aperture, dynamic focusing, and coherent plane-wave compounding
modes. It is shown that in plane-wave imaging systems the Doppler signal spectrum is determined not only by the motion properties of the medium, but also by the spatiotemporal method used to form the Doppler response. The results concerning spatial resolution in the plane-wave compounding mode are also summarized, and the relationship between the geometry of the measurement volume, the sensitivity function, and the spectral parameters is analyzed. Prospects for the further development of these approaches, in particular for applications in shear-wave elastography, are outlined.
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