Diffraction-biased shear wave fields generated with longitudinal magnetic resonance elastography drivers

Meng Yin, Olivier Rouvière, Kevin J. Glaser, Richard Lorne Ehman

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Magnetic resonance elastography (MRE) is a technique for quantifying the acoustic response of biological tissues to propagating waves applied at low frequencies in order to evaluate mechanical properties. Application-specific MRE drivers are typically required to effectively deliver shear waves within the tissue of interest. Surface MRE drivers with transversely oriented vibrations have often been used to directly generate shear waves. These drivers may have disadvantages in certain applications, such as poor penetration depth and inflexible orientation. Therefore, surface MRE drivers with longitudinally oriented vibrations are used in some situations. The purpose of this work was to investigate and optimize a longitudinal driver system for MRE applications. A cone-like hemispherical distribution of shear waves being generated by these drivers and the wave propagation being governed by diffraction in the near field are shown. Using MRE visualization of the vector displacement field, we studied the properties of the shear wave field created by longitudinal MRE drivers of various sizes to identify optimum shear wave imaging planes. The results offer insights and improvements in both experimental design and imaging plane selection for 2-D MRE data acquisition.

Original languageEnglish (US)
Pages (from-to)770-780
Number of pages11
JournalMagnetic Resonance Imaging
Volume26
Issue number6
DOIs
StatePublished - Jul 2008

Fingerprint

Elasticity Imaging Techniques
Shear waves
Magnetic resonance
S waves
magnetic resonance
Diffraction
diffraction
Vibration
Vibrations (mechanical)
Tissue
Imaging techniques
vibration
Acoustics
Design of experiments
Wave propagation
data acquisition
Cones
wave propagation
Data acquisition
near fields

Keywords

  • Diffraction
  • Longitudinal MRE driver
  • Magnetic resonance elastography
  • Shear stiffness
  • Shear wave

ASJC Scopus subject areas

  • Biophysics
  • Clinical Biochemistry
  • Structural Biology
  • Radiology Nuclear Medicine and imaging
  • Condensed Matter Physics

Cite this

Diffraction-biased shear wave fields generated with longitudinal magnetic resonance elastography drivers. / Yin, Meng; Rouvière, Olivier; Glaser, Kevin J.; Ehman, Richard Lorne.

In: Magnetic Resonance Imaging, Vol. 26, No. 6, 07.2008, p. 770-780.

Research output: Contribution to journalArticle

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