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- W2017471192 abstract "Vibro-acoustography (VA) is a medical imaging method based on the nonlinear interaction of two or more distinct ultrasound beams whose frequencies differ by several kHz. In turn, the interacting waves produce a difference-frequency signal which carries the information of the imaged tissue region. Two mechanisms are responsible for the difference-frequency generation (DFG) in VA, namely the dynamic (oscillatory) radiation force and the scattering of sound-by-sound. The role and importance of each phenomenon in VA is assessed here. A theoretical model based on Westervelt's equation for the DFG in the nonlinear scattering of two incident ultrasound waves by a small rigid sphere (compared to the incident wavelengths) is presented. Furthermore, a scattering experiment using VA is devised and the data show very good agreement with the proposed theory. The results reveal that the effect of scattering of sound-by-sound is the dominant component in the DFG in VA rather than the dynamic radiation force." @default.
- W2017471192 created "2016-06-24" @default.
- W2017471192 creator A5065484084 @default.
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- W2017471192 date "2011-08-22" @default.
- W2017471192 modified "2023-09-25" @default.
- W2017471192 title "Difference-frequency generation in vibro-acoustography" @default.
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- W2017471192 doi "https://doi.org/10.1088/0031-9155/56/18/013" @default.
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