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Contrast of echographic images has been highly improved by the injection of microbubbles, due to their nonlinear behavior. However, this contrast enhancement is limited by the nonlinear acoustic propagation in tissue. To overcome this drawback, sub and ultra-harmonic contrast imaging can be used, since only microbubbles can generate these components. Nonlinear modeling is a primordial step in the...
Contrast of echographic images has been highly improved by the injection of ultrasound contrast agents that consist of gaz microbubbles. The improvement is due to the nonlinearity of microbubbles, i.e. when excited with a frequency f0, they can generate harmonics at (2f0, 3f0, …). However, the contrast improvement is limited by the nonlinear ultrasound propagation in tissue. To overcome this drawback,...
Nonlinear Wave Modulation Spectroscopy (NWMS) is one of the most powerful techniques used to detect damage in materials. It consists in simultaneously applying two continuous waves with different frequencies, the one high, ƒ2, and the other low, ƒ1. When the material is damaged, the frequency spectrum exhibits harmonics and sidebands which are located at (ƒ2 + ƒ1) and (ƒ2 − ƒ1). This paper presents...
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