Application of Vibro-Acoustography to Tissue Elasticity Imaging
The image of a tissue deformability is obtained with the vibro-acoustography imaging method using mechanical low frequency (LF) excitation. This ultrasound excitation is locally created by means of a focused annular array emitting two primary beams at two close frequencies, f1 and f2 (f2 = f1 + fLF). The LF acoustic emission resulting from the vibration of the medium is detected by a sensitive hydrophone and then used to form the image. A theoretical model of oscillations in soft biological tissue induced by focused ultrasound is described. In the case of vibro-acoustography, oscillations originate from shear waves induced by an alternative radiation force. This non-invasive imaging method was demonstrated in this study to be suitable for tissue imaging, with x and y transverse resolutions less than 300 m. A vibro-acoustic image of a calcaneus bone slice is presented and compared with images of the same bone realised with other bone imaging methods.
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Document Type: Research Article
Publication date: November 1, 2003
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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