Inverse approach to elasticity reconstruction in shear wave imaging

Vinayak Dutt, Armando Manduca, Raja Muthupillai, Richard L. Ehman, James F. Greenleaf

Research output: Contribution to journalConference article

4 Scopus citations

Abstract

Acoustic shear waves of low frequency can be detected and measured using a phase contrast based magnetic resonance imaging technique called MR Elastography or correlation or phase measurement based echo ultrasound techniques. Spatio-temporal variations of displacements caused by the propagating waves can be used to estimate local values of the elasticity of the object being imaged. The currently employed technique for estimating the elasticity from the wave displacement maps, the local frequency estimator (LFE), has fundamental resolution limits and also has problems with shadowing and other refraction-related artifacts. These problems can be overcome with an inverse approach using Green's function integrals which directly solve the wave equation problem for the propagating wave. The complete measurements of wave displacements as a function of space and time over the object of interest obtained by the above techniques permit an iterative approach to inversion of the wave equation to obtain elasticity and attenuation maps. This article describes the inversion algorithm and evaluates the improvements over the LFE for simulated data and in-vivo breast measurements.

Original languageEnglish (US)
Pages (from-to)1415-1418
Number of pages4
JournalProceedings of the IEEE Ultrasonics Symposium
Volume2
StatePublished - Dec 1 1997
EventProceedings of the 1997 IEEE Ultrasonics Symposium. Part 1 (of 2) - Toronto, Can
Duration: Oct 5 1997Oct 8 1997

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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