Shear wave propagation induced by the acoustic radiation force is currently under investigation. In our experiments, an ultrafast scanner is used both to generate and detect shear waves propagation. The scanner is first used to focus, at a chosen location, a high intensity ultrasonic beam. The resulting acoustic radiation force induces in the focal zone a shear source. The system allows us then to apply very high ultrasound frame rates (up to 5000 images/s) in order to image the shear wave propagation, which velocity is linked to local elasticity properties of the medium. The elasticity map is recovered by solving the inverse problem. Actually, the generation of shear displacement requires high level insonifications at the threshold of FDA norms. Thus, the great advantage of such an ultrafast scanner is to recover the complete propagation by generating a unique palpation inside the medium. Measurements have been performed in several soft tissue mimicking phantoms with different elastic properties and in beef muscles. The 3‐D finite differences simulations have been used to support our experimental results: the delivered acoustic power and the resulting heating induced by the acoustic focused beam can be estimated and compared with the FDA requirements.
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November 2002
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October 25 2002
Ultrafast imaging of shear waves induced by the acoustic radiation force for elasticity imaging in soft tissues
Jeremy Bercoff;
Jeremy Bercoff
Laboratoire Ondes et Acoustique, E.S.P.C.I., C.N.R.S. UMR 7587, Universit Paris VII, 75005 Paris, France
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Mickael Tanter;
Mickael Tanter
Laboratoire Ondes et Acoustique, E.S.P.C.I., C.N.R.S. UMR 7587, Universit Paris VII, 75005 Paris, France
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Sana Chaffai;
Sana Chaffai
Laboratoire Ondes et Acoustique, E.S.P.C.I., C.N.R.S. UMR 7587, Universit Paris VII, 75005 Paris, France
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Mathias Fink
Mathias Fink
Laboratoire Ondes et Acoustique, E.S.P.C.I., C.N.R.S. UMR 7587, Universit Paris VII, 75005 Paris, France
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J. Acoust. Soc. Am. 112, 2404 (2002)
Citation
Jeremy Bercoff, Mickael Tanter, Sana Chaffai, Mathias Fink; Ultrafast imaging of shear waves induced by the acoustic radiation force for elasticity imaging in soft tissues. J. Acoust. Soc. Am. 1 November 2002; 112 (5_Supplement): 2404. https://doi.org/10.1121/1.4779815
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