Three-parameter shear wave inversion in MR elastography of incompressible transverse isotropic media: Application to in vivo lower leg muscles

2015 ◽  
Vol 75 (4) ◽  
pp. 1537-1545 ◽  
Author(s):  
Jing Guo ◽  
Sebastian Hirsch ◽  
Michael Scheel ◽  
Jürgen Braun ◽  
Ingolf Sack
Keyword(s):  
Shear Wave ◽  
Lower Leg ◽  
Mr Elastography ◽  
Leg Muscles ◽  
Wave Inversion ◽  
Isotropic Media ◽  
Transverse Isotropic

scholarly journals Effect of prolonged sitting immobility on shear wave velocity of the lower leg muscles in healthy adults: A proof-of-concept study

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251532
Author(s):  
Kumiko Okino ◽  
Mitsuhiro Aoki ◽  
Masahiro Yamane ◽  
Chikashi Kohmura
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Tibialis Anterior ◽  
Lower Leg ◽  
Medial Gastrocnemius ◽  
Adult Males ◽  
Cellular Space ◽  
Leg Muscles ◽  
Physical Changes

Objective The purpose of this study is to investigate the physical changes of the lower leg muscles in the compartment by observing the changes in the shear wave velocity of the gastrocnemius, soleus and tibialis anterior muscles with time in the sitting position for 2 hours and after elevation of the lower leg. Materials and methods The subjects were 24 healthy adult males (average age 26.6 years). Shear wave velocity was measured by Aplio 500 in immobilized leg immediately after the start of sitting, 60 minutes and 120 minutes after the start of sitting. After 120 minutes the subjects raised the lower leg for 3 minutes, then measured again. Results In the lateral and medial gastrocnemius, there was a significant increase in the velocity at 60 (1.58 ± 0.06, 1.70 ± 0.09 m/s) and 120 minutes (1.70 ± 0.10, 1.83 ± 0.11 m/s) after the start of the test (1.52 ± 0.06, 1.66 ± 0.10 m/s), respectively (p<0.01). In the soleus and the tibialis anterior, there was a significant increase in the velocity at 120 minutes (1.89 ± 0.17, 2.30 ± 0.24 m/s) compared to after the start (1.60 ± 0.15, 2.15 ± 0.26 m/s), respectively (p<0.01). In all muscles, there was a significant decrease in the velocity after the raising compared to that of 120 minutes (p<0.01). Conclusions It has been reported that the change of shear wave velocity with time is proportional to the intramuscular pressure in the leg compartment, and it is assumed that the increase of shear wave velocity in the 2-hour seated leg is due to fluid retention in extra-cellular space of the compartment.

Asymmetrical Neural Adaptation in Lower Leg Muscles as a Consequence of Stereotypical Motor Training

2012 ◽  
Vol 44 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Tetsuya Ogawa ◽  
Noritaka Kawashima ◽  
Shuji Suzuki ◽  
Kimitaka Nakazawa
Keyword(s):  
Lower Leg ◽  
Neural Adaptation ◽  
Motor Training ◽  
Leg Muscles

scholarly journals In vivo quantification of myocardial stiffness in hypertensive porcine hearts using MR elastography

2016 ◽  
Vol 45 (3) ◽  
pp. 813-820 ◽  
Author(s):  
Ria Mazumder ◽  
Samuel Schroeder ◽  
Xiaokui Mo ◽  
Bradley D Clymer ◽  
Richard D White ◽  
...  
Keyword(s):  
Mr Elastography ◽  
Myocardial Stiffness
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