scholarly journals Full Characterization of in vivo Muscle as an Elastic, Incompressible, Transversely Isotropic Material using Ultrasonic Rotational 3D Shear Wave Elasticity Imaging

Author(s):  
Anna E. Knight ◽  
Courtney A. Trutna ◽  
Ned C. Rouze ◽  
Lisa D. Hobson-Webb ◽  
Annette Caenen ◽  
...  
2020 ◽  
Vol 47 (3) ◽  
pp. 1404-1410
Author(s):  
Wei‐Huan Xie ◽  
Chun‐Ting Su ◽  
Yu‐Chieh Jill Kao ◽  
Tung‐Hao Chang ◽  
Yuan‐Jen Chang ◽  
...  

2019 ◽  
Vol 9 (5) ◽  
pp. 20190030 ◽  
Author(s):  
Lindsey C. Carlson ◽  
Timothy J. Hall ◽  
Ivan M. Rosado-Mendez ◽  
Lu Mao ◽  
Helen Feltovich

We report here the results of a longitudinal study of cervix stiffness during pregnancy. Thirty women, ages ranging from 19 to 37 years, were scanned with ultrasound at five time points beginning at their normal first-trimester screening (8–13 weeks) through term pregnancy (nominally 40 week) using a clinical ultrasound imaging system modified with a special ultrasound transducer and system software. The system estimated the shear wave speed (its square proportional to the shear modulus under idealized conditions) in the cervix. We found a constant fractional reduction (about 4% per week) in shear wave speed with increasing gestational age. We also demonstrated a spatial gradient in shear wave speed along the length of the cervix (softest at the distal end). Results were consistent with our previous ex vivo and in vivo work in women. Shear wave elasticity imaging may be a potentially useful clinical tool for objective assessment of cervical softening in pregnancy.


Author(s):  
Courtney A. Trutna ◽  
Anna E. Knight ◽  
Ned C. Rouze ◽  
Lisa D. Hobson-Webb ◽  
Mark L. Palmeri ◽  
...  

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1443-1448
Author(s):  
YUE-XIU WU ◽  
QUAN-SHENG LIU

To understand the dynamic response of transversely isotropic material under explosion load, the analysis is done with the help of ABAQUS software and the constitutive equations of transversely isotropic material with different angle of isotropic section. The result is given: when the angle of isotropic section is settled, the velocity and acceleration of measure points decrease with the increasing distance from the explosion borehole. The velocity and acceleration in the loading direction are larger than those in the normal direction of the loading direction and their attenuation are much faster. When the angle of isotropic section is variable, the evolution curves of peak velocity and peak acceleration in the loading direction with the increasing angles are notching parabolic curves. They get their minimum values when the angle is equal to 45 degree. But the evolution curves of peak velocity and peak acceleration in the normal direction of the loading direction with the increasing angles are overhead parabolic curves. They get their maximum values when the angle is equal to 45 degree.


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