### 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 language | English (US) |
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Title of host publication | Proceedings of the IEEE Ultrasonics Symposium |

Editors | S.C. Schneider, M. Levy, B.R. McAvoy |

Publisher | IEEE |

Pages | 1415-1418 |

Number of pages | 4 |

Volume | 2 |

State | Published - 1997 |

Event | Proceedings of the 1997 IEEE Ultrasonics Symposium. Part 1 (of 2) - Toronto, Can Duration: Oct 5 1997 → Oct 8 1997 |

### Other

Other | Proceedings of the 1997 IEEE Ultrasonics Symposium. Part 1 (of 2) |
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City | Toronto, Can |

Period | 10/5/97 → 10/8/97 |

### Fingerprint

### ASJC Scopus subject areas

- Engineering(all)

### Cite this

*Proceedings of the IEEE Ultrasonics Symposium*(Vol. 2, pp. 1415-1418). IEEE.

**Inverse approach to elasticity reconstruction in shear wave imaging.** / Dutt, Vinayak; Manduca, Armando; Muthupillai, Raja; Ehman, Richard Lorne; Greenleaf, James F.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Proceedings of the IEEE Ultrasonics Symposium.*vol. 2, IEEE, pp. 1415-1418, Proceedings of the 1997 IEEE Ultrasonics Symposium. Part 1 (of 2), Toronto, Can, 10/5/97.

}

TY - GEN

T1 - Inverse approach to elasticity reconstruction in shear wave imaging

AU - Dutt, Vinayak

AU - Manduca, Armando

AU - Muthupillai, Raja

AU - Ehman, Richard Lorne

AU - Greenleaf, James F

PY - 1997

Y1 - 1997

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0031363427&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031363427&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0031363427

VL - 2

SP - 1415

EP - 1418

BT - Proceedings of the IEEE Ultrasonics Symposium

A2 - Schneider, S.C.

A2 - Levy, M.

A2 - McAvoy, B.R.

PB - IEEE

ER -