Parametrically phase'conjugate waves: applications in nonlinear acoustic imaging and diagnostics

Preobrazhenskii, V.V.

doi:10.3367/ufnr.0176.200601i.0108

Cited by 8 publications

(1 citation statement)

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“…In such case nonlinear harmonic imaging can be successfully applied for the diagnostics. Ultrasonic wave phase conjugation (WPC) [ 2] is of special interest for harmonic acoustic imaging [3,4] owing to possibilities of selection, conjugation and amplification of harmonic components of nonlinear probing waves [ 5,6,7] automatic con-focality of phase conjugate harmonics and compensation of phase distortions in linear and nonlinear modes of wave propagation [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Acoustic Imaging of Isoechogenic Objects and Flows Using Ultrasound Wave Phase Conjugation

Preobrazhensky¹,

Pernod²,

Pyl'Nov³

et al. 2009

Acta Acustica united with Acustica

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The results of theoretical and experimental studies of application of parametric wave phase conjugation (WPC) forn onlinear detection of isoechogenic phantoms and for ultrasonic velocimetry of flows are reported. Experimental WPC harmonic imaging of isoechogenic phantoms in water wasd emonstrated on an example of cells filled with am ixture of water and methyl alcohol. Va riation of methanol concentration allows obtaining some mixtures with varied nonlinear parameters while their linear acoustic impedance remains close to the water's one. Analysis of harmonics of phase conjugate waves(PCW)i nautomatically con-focal WPC-system provides reliable detection of the phantoms. According to the theoretical predictions the contrasts of images are comparable with, or even stronger,t han the ratio of nonlinear parameters of ap hantom and its surrounding medium. 3D-simulation of propagation of PCW in heterogeneously nonlinear and moving media is developed. Break of time reversal invariance of WPC in moving media is proposed as ap rinciple of detection and velocimetry of flows. The results of experimental linear and harmonic imaging of flows in water are presented in comparison with theoretical description.

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