Magnetic resonance elastography of the lungs: A repeatability and reproducibility study

2019 ◽  
pp. e4102 ◽  
Author(s):  
Faisal Fakhouri ◽  
Huiming Dong ◽  
Arunark Kolipaka
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Elastography ◽  
Reproducibility Study ◽  
Repeatability And Reproducibility

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.

Stiffness change of the supraspinatus muscle can be detected by magnetic resonance elastography

2021 ◽  
Author(s):  
Akihisa Koga ◽  
Yoshiaki Itoigawa ◽  
Mikio Suga ◽  
Daichi Morikawa ◽  
Hirohisa Uehara ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Elastography ◽  
Supraspinatus Muscle
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