Improved inversion of MR elastography images by spatio-temporal directional filtering

Armando Manduca; David S. Lake; Richard L. Ehman

doi:10.1117/12.483589

Improved inversion of MR elastography images by spatio-temporal directional filtering

Armando Manduca, David S. Lake, Richard L. Ehman

Research output: Contribution to journal › Conference article › peer-review

9 Scopus citations

Abstract

MR elastography can visualize and measure propagating shear waves in tissue-like materials subjected to harmonic mechanical excitation. This allows the calculation of local values of material parameters such as shear modulus and attenuation. Various inversion algorithms to perform such calculations have been proposed, but they are sensitive to areas of low displacement amplitude (and hence low SNR) that result from interference patterns due to reflection and refraction. A spatio-temporal directional filter applied as a pre-processing step can separate interfering waves so they can be processed separately. Weighted combinations of inversions from such directionally separated data sets can significantly improve reconstructions of shear modulus and attenuation.

Original language	English (US)
Pages (from-to)	445-452
Number of pages	8
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	5032 I
DOIs	https://doi.org/10.1117/12.483589
State	Published - Sep 15 2003
Event	Medical Imaging 2003: Image Processing - San Diego, CA, United States Duration: Feb 17 2003 → Feb 20 2003

Keywords

Digital filters
Elasticity
Elastography
Inversion algorithms
Shear modulus
Shear wave
Tissue characterization
Wave propagation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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10.1117/12.483589

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title = "Improved inversion of MR elastography images by spatio-temporal directional filtering",

abstract = "MR elastography can visualize and measure propagating shear waves in tissue-like materials subjected to harmonic mechanical excitation. This allows the calculation of local values of material parameters such as shear modulus and attenuation. Various inversion algorithms to perform such calculations have been proposed, but they are sensitive to areas of low displacement amplitude (and hence low SNR) that result from interference patterns due to reflection and refraction. A spatio-temporal directional filter applied as a pre-processing step can separate interfering waves so they can be processed separately. Weighted combinations of inversions from such directionally separated data sets can significantly improve reconstructions of shear modulus and attenuation.",

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T1 - Improved inversion of MR elastography images by spatio-temporal directional filtering

AU - Manduca, Armando

AU - Lake, David S.

AU - Ehman, Richard L.

PY - 2003/9/15

Y1 - 2003/9/15

N2 - MR elastography can visualize and measure propagating shear waves in tissue-like materials subjected to harmonic mechanical excitation. This allows the calculation of local values of material parameters such as shear modulus and attenuation. Various inversion algorithms to perform such calculations have been proposed, but they are sensitive to areas of low displacement amplitude (and hence low SNR) that result from interference patterns due to reflection and refraction. A spatio-temporal directional filter applied as a pre-processing step can separate interfering waves so they can be processed separately. Weighted combinations of inversions from such directionally separated data sets can significantly improve reconstructions of shear modulus and attenuation.

AB - MR elastography can visualize and measure propagating shear waves in tissue-like materials subjected to harmonic mechanical excitation. This allows the calculation of local values of material parameters such as shear modulus and attenuation. Various inversion algorithms to perform such calculations have been proposed, but they are sensitive to areas of low displacement amplitude (and hence low SNR) that result from interference patterns due to reflection and refraction. A spatio-temporal directional filter applied as a pre-processing step can separate interfering waves so they can be processed separately. Weighted combinations of inversions from such directionally separated data sets can significantly improve reconstructions of shear modulus and attenuation.

KW - Digital filters

KW - Elasticity

KW - Elastography

KW - Inversion algorithms

KW - Shear modulus

KW - Shear wave

KW - Tissue characterization

KW - Wave propagation

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VL - 5032 I

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EP - 452

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

T2 - Medical Imaging 2003: Image Processing

Y2 - 17 February 2003 through 20 February 2003

ER -

Improved inversion of MR elastography images by spatio-temporal directional filtering

Abstract

Keywords

ASJC Scopus subject areas

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