Title :
Supercritical parametric wave phase conjugation as an instrument for narrowband analysis in ultrasonic harmonic imaging
Author :
Krutyansky, Leonid ; Pernod, Philippe ; Brysev, Andrei ; Bunkin, Fedor V. ; Preobrazhensky, Vladimir
Author_Institution :
Wave Phenomena Dept., Gen. Phys. Inst., Moscow, Russia
fDate :
4/1/2002 12:00:00 AM
Abstract :
Supercritical parametric wave phase conjugation (SWPC) is used for selection and phase conjugation of harmonic components of a nonlinear incident wave. The amplitude of the phase conjugate wave in a supercritical mode is high enough for acoustic nonlinearity of the propagation medium to appear. As a result, in particular, doubled and quadrupled frequencies of the incident wave become available for image formation at the same order of the medium nonlinearity. The improvement of the imaging system resolution because of harmonic analysis of the received acoustic signal and compensation of phase distortions caused by wave phase conjugation were observed simultaneously when the propagation medium was inhomogeneous.
Keywords :
acoustic signal processing; biomedical ultrasonics; inhomogeneous media; nonlinear acoustics; ultrasonic imaging; acoustic nonlinearity; diagnostic medical ultrasound; doubled frequencies; harmonic analysis; harmonic component selection; image formation; imaging system resolution; inhomogeneous propagation medium; narrowband analysis; nonlinear incident wave; phase conjugate wave amplitude; phase distortion compensation; quadrupled frequencies; received acoustic signal; supercritical parametric wave phase conjugation; ultrasonic harmonic imaging; Acoustic imaging; Acoustic propagation; Acoustic waves; Frequency; Harmonic analysis; Image analysis; Instruments; Narrowband; Nonlinear acoustics; Ultrasonic imaging;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
