3D FFT Mode Filtering for Phase Gradient Velocity Measurements

Smith, James A.; Lawrence, A J; Ehman, Richard L.

doi:10.1007/978-1-4615-4791-4_205

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…Bishop et al (1998) applied this technique to the problem of visualizing shear wave propagation in excised tissue samples. Later, Smith et al (1999) proposed a method to filter out the other modes of motion such as reflections, vibrations and ambient background motions that sometimes obscure the accurate measurement of the shear waves when using this technique. Catheline et al (1999) proposed an ultrasound technique, which they call transient elastography, to deal with some of artefact issues caused by wave reflection and standing waves.…”

Section: Introductionmentioning

confidence: 99%

Sonoelastographic imaging of interference patterns for estimation of the shear velocity of homogeneous biomaterials

et al. 2004

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The shear wave velocity is one of a few important parameters that characterize the mechanical properties of bio-materials. In this paper, two noninvasive methods are proposed to measure the shear velocity by inspecting the shear wave interference patterns. In one method, two shear wave sources are placed on the opposite two sides of a sample, driven by the identical sinusoidal signals. The shear waves from the two sources interact to create interference patterns, which are visualized by the vibration sonoelastography technique. The spacing between the pattern bands equals half of the shear wavelength. The shear velocity can be obtained by taking the product of the wavelength and the frequency. An alternative method is to drive the two vibration sources at slightly different frequencies. In this case, the interference patterns no longer remain stationary. It is proved that the apparent velocity of the moving patterns is proportional to the shear velocity in the medium. Since the apparent velocity of the patterns can be measured by analysing the video sequence, the shear velocity can be obtained thereafter. These approaches are validated by a conventional shear wave time-of-flight approach, and they are accurate within 4% on various homogeneous tissue-mimicking phantoms.

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Section: Introductionmentioning

confidence: 99%