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Remotely induced shear acoustic waves in tissues by radiation force of focused ultrasound

Authors :
Armen Sarvazyan
Oleg Rudenko
Source :
The Journal of the Acoustical Society of America. 99:2465-2500
Publication Year :
1996
Publisher :
Acoustical Society of America (ASA), 1996.

Abstract

A new acoustic approach to medical imaging and diagnostics based on the remote evaluation of shear elasticity modulus of soft tissues is considered. The new method, called shear wave elasticity imaging, is based on the detection of shear waves remotely generated in tissues by radiation pressure of amplitudeā€modulated focused ultrasound. Remotely induced shear wave is fully attenuated within a short distance and the induced strain in the tissue can be extremely localized. By choosing appropriate temporal characteristics of the amplitudeā€modulated ultrasonic pulse, the volume of tissue involved in the mechanical excitation can be kept on the order of 1=A0 cm3, in contrast to other methods of elasticity imaging where the complete organ is subjected to shear stress. Consequently, evaluation of viscoelastic properties of tissue is greatly simplified since trivial boundary conditions can be assumed and an infinite medium model can be used to reconstruct the mechanical properties of tissue. Analytical equations ...

Details

ISSN :
00014966
Volume :
99
Database :
OpenAIRE
Journal :
The Journal of the Acoustical Society of America
Accession number :
edsair.doi...........ebe30bc7634780bad27f6e890a721e71
Full Text :
https://doi.org/10.1121/1.415509