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

Research output: Contribution to journalConference article

7 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 languageEnglish (US)
Pages (from-to)445-452
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5032 I
DOIs
StatePublished - Sep 15 2003
EventMedical Imaging 2003: Image Processing - San Diego, CA, United States
Duration: Feb 17 2003Feb 20 2003

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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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