scholarly journals Observation of nonlinear shear wave propagation using magnetic resonance elastography

2004 ◽  
Vol 52 (4) ◽  
pp. 842-850 ◽  
Author(s):  
Ingolf Sack ◽  
Christopher K. Mcgowan ◽  
Abbas Samani ◽  
Chris Luginbuhl ◽  
Wendy Oakden ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Magnetic Resonance ◽  
Shear Wave ◽  
Magnetic Resonance Elastography ◽  
Nonlinear Shear

A finite element model for analyzing shear wave propagation observed in magnetic resonance elastography

2005 ◽  
Vol 38 (11) ◽  
pp. 2198-2203 ◽  
Author(s):  
Qingshan Chen ◽  
Stacie I. Ringleb ◽  
Armando Manduca ◽  
Richard L. Ehman ◽  
Kai-Nan An
Keyword(s):  
Finite Element ◽  
Wave Propagation ◽  
Magnetic Resonance ◽  
Finite Element Model ◽  
Shear Wave ◽  
Element Model ◽  
Magnetic Resonance Elastography

scholarly journals Rescaled Local Interaction Simulation Approach for Shear Wave Propagation Modelling in Magnetic Resonance Elastography

2016 ◽  
Vol 2016 ◽  
pp. 1-12
Author(s):  
Z. Hashemiyan ◽  
P. Packo ◽  
W. J. Staszewski ◽  
T. Uhl
Keyword(s):  
Wave Propagation ◽  
Magnetic Resonance ◽  
Shear Wave ◽  
Soft Tissues ◽  
Biological Tissues ◽  
Magnetic Resonance Elastography ◽  
Local Interaction ◽  
Simulation Approach ◽  
Interaction Simulation ◽  
Propagation Modelling

Properties of soft biological tissues are increasingly used in medical diagnosis to detect various abnormalities, for example, in liver fibrosis or breast tumors. It is well known that mechanical stiffness of human organs can be obtained from organ responses to shear stress waves through Magnetic Resonance Elastography. The Local Interaction Simulation Approach is proposed for effective modelling of shear wave propagation in soft tissues. The results are validated using experimental data from Magnetic Resonance Elastography. These results show the potential of the method for shear wave propagation modelling in soft tissues. The major advantage of the proposed approach is a significant reduction of computational effort.

scholarly journals Lorentz force induced shear waves for magnetic resonance elastography applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Guillaume Flé ◽  
Guillaume Gilbert ◽  
Pol Grasland-Mongrain ◽  
Guy Cloutier
Keyword(s):  
Magnetic Resonance ◽  
Shear Wave ◽  
Lorentz Force ◽  
Wave Attenuation ◽  
Shear Waves ◽  
Estimation Method ◽  
Biological Tissues ◽  
Magnetic Resonance Elastography ◽  
Motion Generation ◽  
Wave Source

AbstractQuantitative mechanical properties of biological tissues can be mapped using the shear wave elastography technique. This technology has demonstrated a great potential in various organs but shows a limit due to wave attenuation in biological tissues. An option to overcome the inherent loss in shear wave magnitude along the propagation pathway may be to stimulate tissues closer to regions of interest using alternative motion generation techniques. The present study investigated the feasibility of generating shear waves by applying a Lorentz force directly to tissue mimicking samples for magnetic resonance elastography applications. This was done by combining an electrical current with the strong magnetic field of a clinical MRI scanner. The Local Frequency Estimation method was used to assess the real value of the shear modulus of tested phantoms from Lorentz force induced motion. Finite elements modeling of reported experiments showed a consistent behavior but featured wavelengths larger than measured ones. Results suggest the feasibility of a magnetic resonance elastography technique based on the Lorentz force to produce an shear wave source.

scholarly journals Needle shear wave driver for magnetic resonance elastography

2006 ◽  
Vol 55 (5) ◽  
pp. 1175-1179 ◽  
Author(s):  
Q.C.C. Chan ◽  
G. Li ◽  
R.L. Ehman ◽  
R.C. Grimm ◽  
R. Li ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Shear Wave ◽  
Magnetic Resonance Elastography
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