scholarly journals Calibration of the shear wave speed-stress relationship in ex vivo tendons

2019 ◽  
Vol 90 ◽  
pp. 9-15 ◽  
Author(s):  
Jack A. Martin ◽  
Dylan G. Schmitz ◽  
Alexander C. Ehlers ◽  
Matthew S. Allen ◽  
Darryl G. Thelen
Keyword(s):  
Shear Wave ◽  
Wave Speed ◽  
Ex Vivo ◽  
Shear Wave Speed

Shear Wave Speeds Track Axial Stress in Porcine Collateral Ligaments

2019 ◽  
Author(s):  
Jonathon Blank ◽  
Darryl Thelen ◽  
Joshua Roth
Keyword(s):  
Shear Wave ◽  
Wave Speed ◽  
Ex Vivo ◽  
Axial Stress ◽  
Axial Loading ◽  
Orthopedic Procedures ◽  
Stress Distributions ◽  
Collateral Ligaments ◽  
Wave Speeds ◽  
Shear Wave Speed

Ligament tension is an important factor that can affect the success of total knee arthroplasty (TKA) procedures. However, surgeons currently lack objective approaches for assessing tension in a particular ligament intraoperatively. The purpose of this study was to investigate the use of noninvasive shear wave tensiometry to characterize stress in medial and lateral collateral ligaments (MCLs and LCLs) ex vivo. Nine porcine MCL and LCL specimens were subjected to cyclic axial loading while wave speeds were measured using laser vibrometry. We found that squared shear wave speed increased linearly with stress in both the MCL (r2avg = 0.94) and LCL (r2avg = 0.98). Wave speeds were slightly lower in the MCL than the LCL when subjected to comparable axial stress (p < 0.001). Ligament-specific wave speeds may arise from differences in geometry and stress distributions between ligaments. These observations suggest it may be feasible to use noninvasive shear wave speed measures as a proxy of ligament loading during orthopedic procedures such as TKA.

Comparison of shear wave speed estimates in Ex vivo non-pregnant vs. In vivo pregnant cervix

2014 ◽  
Author(s):  
Lindsey C. Carlson ◽  
Helen Feltovich ◽  
Mark M. Palmeri ◽  
Alejandro Munoz Del Rio ◽  
Stephanie Romero ◽  
...  
Keyword(s):  
Shear Wave ◽  
Wave Speed ◽  
Ex Vivo ◽  
Shear Wave Speed

Ex vivo measurement of shear wave speed dispersion in placenta using transient elastography

2015 ◽  
Author(s):  
Samuel Calle ◽  
Marie-Coline Dumoux ◽  
Emmanuel Nicolas ◽  
Jean-Pierre Remenieras ◽  
Emmanuel Simon ◽  
...  
Keyword(s):  
Shear Wave ◽  
Wave Speed ◽  
Transient Elastography ◽  
Ex Vivo ◽  
Shear Wave Speed

scholarly journals Measurement of shear wave speed dispersion in the placenta by transient elastography: A preliminary ex vivo study

PLoS ONE ◽  
2018 ◽  
Vol 13 (4) ◽  
pp. e0194309 ◽  
Author(s):  
Emmanuel G. Simon ◽  
Samuel Callé ◽  
Franck Perrotin ◽  
Jean-Pierre Remenieras
Keyword(s):  
Shear Wave ◽  
Wave Speed ◽  
Transient Elastography ◽  
Ex Vivo ◽  
Shear Wave Speed ◽  
Ex Vivo Study

scholarly journals Spatial variations in Achilles tendon shear wave speed

2014 ◽  
Vol 47 (11) ◽  
pp. 2685-2692 ◽  
Author(s):  
Ryan J. DeWall ◽  
Laura C. Slane ◽  
Kenneth S. Lee ◽  
Darryl G. Thelen
Keyword(s):  
Achilles Tendon ◽  
Shear Wave ◽  
Wave Speed ◽  
Spatial Variations ◽  
Shear Wave Speed

Measured temperature and pressure dependence of Vp and Vs in compacted, polycrystalline sI methane and sII methane–ethane hydrate

2003 ◽  
Vol 81 (1-2) ◽  
pp. 47-53 ◽  
Author(s):  
M B Helgerud ◽  
W F Waite ◽  
S H Kirby ◽  
A Nur
Keyword(s):  
High Pressure ◽  
Shear Wave ◽  
Pressure Dependence ◽  
Gas Hydrate ◽  
Pressure Vessel ◽  
Wave Speed ◽  
Measured Temperature ◽  
Shear Wave Speed ◽  
Temperature And Pressure ◽  
Fixed End

We report on compressional- and shear-wave-speed measurements made on compacted polycrystalline sI methane and sII methane–ethane hydrate. The gas hydrate samples are synthesized directly in the measurement apparatus by warming granulated ice to 17°C in the presence of a clathrate-forming gas at high pressure (methane for sI, 90.2% methane, 9.8% ethane for sII). Porosity is eliminated after hydrate synthesis by compacting the sample in the synthesis pressure vessel between a hydraulic ram and a fixed end-plug, both containing shear-wave transducers. Wave-speed measurements are made between –20 and 15°C and 0 to 105 MPa applied piston pressure. PACS No.: 61.60Lj

Diagnosis of liver fibrosis based on quantification of factors associated with shear wave speed

Choonpa Igaku ◽  
2021 ◽  
Author(s):  
Hiroko IIJIMA ◽  
Toshifumi TADA ◽  
Hiroyuki HACHIYA ◽  
Takashi NISHIMURA ◽  
Junko NISHIMURA ◽  
...  
Keyword(s):  
Liver Fibrosis ◽  
Shear Wave ◽  
Wave Speed ◽  
Shear Wave Speed ◽  
Factors Associated

scholarly journals A soft cervix, categorized by shear-wave elastography, in women with short or with normal cervical length at 18–24 weeks is associated with a higher prevalence of spontaneous preterm delivery

2018 ◽  
Vol 46 (5) ◽  
pp. 489-501 ◽  
Author(s):  
Edgar Hernandez-Andrade ◽  
Eli Maymon ◽  
Suchaya Luewan ◽  
Gaurav Bhatti ◽  
Mohammad Mehrmohammadi ◽  
...  
Keyword(s):  
Cohort Study ◽  
Preterm Delivery ◽  
Shear Wave ◽  
Wave Speed ◽  
Shear Wave Elastography ◽  
Cervical Length ◽  
Singleton Pregnancy ◽  
Short Cervix ◽  
Shear Wave Speed ◽  
Spontaneous Preterm Delivery

AbstractObjective:To determine whether a soft cervix identified by shear-wave elastography between 18 and 24 weeks of gestation is associated with increased frequency of spontaneous preterm delivery (sPTD).Materials and methods:This prospective cohort study included 628 consecutive women with a singleton pregnancy. Cervical length (mm) and softness [shear-wave speed: (SWS) meters per second (m/s)] of the internal cervical os were measured at 18–24 weeks of gestation. Frequency of sPTD <37 (sPTD<37) and <34 (sPTD<34) weeks of gestation was compared among women with and without a short (≤25 mm) and/or a soft cervix (SWS <25thpercentile).Results:There were 31/628 (4.9%) sPTD<37 and 12/628 (1.9%) sPTD<34 deliveries. The combination of a soft and a short cervix increased the risk of sPTD<37 by 18-fold [relative risk (RR) 18.0 (95% confidence interval [CI], 7.7–43.9); P<0.0001] and the risk of sPTD<34 by 120-fold [RR 120.0 (95% CI 12.3–1009.9); P<0.0001] compared to women with normal cervical length. A soft-only cervix increased the risk of sPTD<37 by 4.5-fold [RR 4.5 (95% CI 2.1–9.8); P=0.0002] and of sPTD<34 by 21-fold [RR 21.0 (95% CI 2.6–169.3); P=0.0003] compared to a non-soft cervix.Conclusions:A soft cervix at 18–24 weeks of gestation increases the risk of sPTD <37 and <34 weeks of gestation independently of cervical length.

Sign in / Sign up

Export Citation Format

Share Document