Shear wave speed recovery in sonoelastography using crawling wave data.

The Journal of the Acoustical Society of America
Kui LinAshley Thomas

Abstract

The crawling wave experiment, in which two harmonic sources oscillate at different but nearby frequencies, is a development in sonoelastography that allows real-time imaging of propagating shear wave interference patterns. Previously the crawling wave speed was recovered and used as an indicator of shear stiffness; however, it is shown in this paper that the crawling wave speed image can have artifacts that do not represent a change in stiffness. In this paper, the locations and shapes of some of the artifacts are exhibited. In addition, a differential equation is established that enables imaging of the shear wave speed, which is a quantity strongly correlated with shear stiffness change. The full algorithm is as follows: (1) extract the crawling wave phase from the spectral variance data; (2) calculate the crawling wave phase wave speed; (3) solve a first-order PDE for the phase of the wave emanating from one of the sources; and (4) compute and image the shear wave speed on a grid in the image plane.

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Citations

Jul 23, 2011·Medical Physics·Liwei AnKevin J Parker
Jul 27, 2011·The Journal of the Acoustical Society of America·Kui LinDeborah J Rubens
Dec 20, 2011·Ultrasound in Medicine & Biology·Christopher HazardKevin Parker
Dec 20, 2011·Ultrasound in Medicine & Biology·Christopher T BarryKevin J Parker
Mar 28, 2017·Journal of Clinical Urology·Hugh Harvey, Nandita M deSouza

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