THE INFLUENCE OF THE DYNAMIC CHANGE OF ULTRASOUND SYSTEM SENSITIVITY FUNCTION ON THE SPECTRA OF DOPPLER RESPONSE SIGNALS

The previously developed continuum model of ultrasound wave scattering from inhomogeneities of mass density and compressibility was generalized in the present paper to the case of dynamically changing sensitivity function of ultrasound diagnostic system. The general expression relating the full power spectrum of Doppler response signal from the region of interest to spectral characteristics of scattering inhomogeneities movement and components of the probing ultrasound fields on spatial and temporal harmonics was obtained. The results of the work can be useful for the analysis of spectra obtained by means of modern diagnostic systems with dynamic focusing of transmitted beams by synthetic aperture method.