title: Ultrasound Elastography and MR Elastography for Assessing Liver Fibrosis: Part 1, Principles and Techniques.
abstract: OBJECTIVE
  The purpose of this article is to provide an overview of ultrasound and MR elastography, including a glossary of relevant terminology, a classification of elastography techniques, and a discussion of their respective strengths and limitations.
  
  
  CONCLUSIONS
  Elastography is an emerging technique for the noninvasive assessment of mechanical tissue properties. These techniques report metrics related to tissue stiffness, such as shear-wave speed, magnitude of the complex shear modulus, and the Young modulus.
authors.affiliation: 1 Department of Radiology, Centre Hospitalier de l'Université de Montréal, Montréal, QC, Canada.|2 Centre de Recherche du Centre Hospitalier de l'Université de Montréal, Montréal, QC, Canada.|3 Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, QC, Canada.
authors.forename: An
authors.initials: A
authors.lastname: Tang
authors.affiliation: 2 Centre de Recherche du Centre Hospitalier de l'Université de Montréal, Montréal, QC, Canada.|3 Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, QC, Canada.|4 Institute of Biomedical Engineering, Université de Montréal, Montréal, QC, Canada.|5 Laboratory of Biorheology and Medical Ultrasonics, Centre hospitalier de l'Université de Montréal, Montréal, QC, Canada.
authors.forename: Guy
authors.initials: G
authors.lastname: Cloutier
authors.affiliation: 6 Liver Imaging Group, Department of Radiology, University of California San Diego, 408 Dickinson St, San Diego, CA 92103-8226.
authors.forename: Nikolaus M
authors.initials: NM
authors.lastname: Szeverenyi
authors.affiliation: 6 Liver Imaging Group, Department of Radiology, University of California San Diego, 408 Dickinson St, San Diego, CA 92103-8226.
authors.forename: Claude B
authors.initials: CB
authors.lastname: Sirlin
mesh_terms: D055119:Elastic Modulus; D054459:Elasticity Imaging Techniques / Q000379:methods*; D006801:Humans; D008103:Liver Cirrhosis / Q000175:diagnosis* / Q000000981:diagnostic imaging; D008279:Magnetic Resonance Imaging / Q000379:methods*; D014783:Viscosity
keywords: MR elastography (MRE); MRI; elasticity; elastography; liver fibrosis; shear stiffness; shear wave; ultrasound; viscoelasticity; viscosity