Imaging of shear waves induced by Lorentz force in soft solids

2013 ◽  
Author(s):  
Pol Grasland-Mongrain ◽  
Stefan Catheline ◽  
Remi Souchon ◽  
Florian Cartellier ◽  
Ali Zorgani ◽  
...  
Keyword(s):  
Lorentz Force ◽  
Shear Waves ◽  
Soft Solids

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.

Parametric excitation of shear waves in soft solids

2009 ◽  
Vol 55 (4-5) ◽  
pp. 567-574 ◽  
Author(s):  
M. A. Mironov ◽  
P. A. Pyatakov ◽  
I. I. Konopatskaya ◽  
G. T. Clement ◽  
N. I. Vykhodtseva
Keyword(s):  
Parametric Excitation ◽  
Shear Waves ◽  
Soft Solids

Shear waves and shocks in soft solids

2007 ◽  
Vol 75 (1) ◽  
Author(s):  
Hervé Tabuteau ◽  
Darek Sikorski ◽  
John R. de Bruyn
Keyword(s):  
Shear Waves ◽  
Soft Solids

Shear waves induced by Lorentz force in soft tissues

2014 ◽  
Vol 136 (4) ◽  
pp. 2279-2279
Author(s):  
Stefan Catheline ◽  
Graland-Mongrain Pol ◽  
Ali Zorgani ◽  
Remi Souchon ◽  
Cyril Lafon ◽  
...  
Keyword(s):  
Lorentz Force ◽  
Soft Tissues ◽  
Shear Waves

Modeling of nonlinear shear waves in soft solids

2004 ◽  
Vol 116 (5) ◽  
pp. 2807-2813 ◽  
Author(s):  
Evgenia A. Zabolotskaya ◽  
Mark F. Hamilton ◽  
Yurii A. Ilinskii ◽  
G. Douglas Meegan
Keyword(s):  
Shear Waves ◽  
Soft Solids ◽  
Nonlinear Shear

scholarly journals Numerical Simulation of Focused Shock Shear Waves in Soft Solids and a Two-Dimensional Nonlinear Homogeneous Model of the Brain

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
B. Giammarinaro ◽  
F. Coulouvrat ◽  
G. Pinton
Keyword(s):  
Shock Wave ◽  
Numerical Methods ◽  
Shock Waves ◽  
Scaling Laws ◽  
Soft Tissues ◽  
Shear Waves ◽  
Homogeneous Model ◽  
Nonlinear Propagation ◽  
Soft Solids ◽  
The Brain

Shear waves that propagate in soft solids, such as the brain, are strongly nonlinear and can develop into shock waves in less than one wavelength. We hypothesize that these shear shock waves could be responsible for certain types of traumatic brain injuries (TBI) and that the spherical geometry of the skull bone could focus shear waves deep in the brain, generating diffuse axonal injuries. Theoretical models and numerical methods that describe nonlinear polarized shear waves in soft solids such as the brain are presented. They include the cubic nonlinearities that are characteristic of soft solids and the specific types of nonclassical attenuation and dispersion observed in soft tissues and the brain. The numerical methods are validated with analytical solutions, where possible, and with self-similar scaling laws where no known solutions exist. Initial conditions based on a human head X-ray microtomography (CT) were used to simulate focused shear shock waves in the brain. Three regimes are investigated with shock wave formation distances of 2.54 m, 0.018 m, and 0.0064 m. We demonstrate that under realistic loading scenarios, with nonlinear properties consistent with measurements in the brain, and when the shock wave propagation distance and focal distance coincide, nonlinear propagation can easily overcome attenuation to generate shear shocks deep inside the brain. Due to these effects, the accelerations in the focal are larger by a factor of 15 compared to acceleration at the skull surface. These results suggest that shock wave focusing could be responsible for diffuse axonal injuries.

scholarly journals Imaging of Shear Waves Induced by Lorentz Force in Soft Tissues

2014 ◽  
Vol 113 (3) ◽  
Author(s):  
P. Grasland-Mongrain ◽  
R. Souchon ◽  
F. Cartellier ◽  
A. Zorgani ◽  
J. Y. Chapelon ◽  
...  
Keyword(s):  
Lorentz Force ◽  
Soft Tissues ◽  
Shear Waves

Parametric Excitation of Shear Waves in Soft Solids

2008 ◽  
Author(s):  
Mikhail Mironov ◽  
Irina Konopatskaya ◽  
Pavel Pyatakov ◽  
Gregory Clement ◽  
Natalia Vykhodtseva ◽  
...  
Keyword(s):  
Parametric Excitation ◽  
Shear Waves ◽  
Soft Solids

Micro-elastography: Toward ultrasonic shear waves in soft solids

2021 ◽  
Vol 118 (11) ◽  
pp. 113701
Author(s):  
G. Laloy-Borgna ◽  
A. Zorgani ◽  
S. Catheline
Keyword(s):  
Shear Waves ◽  
Soft Solids ◽  
Ultrasonic Shear
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