Dimensions and mechanical properties of porcine aortic segments determined by combined impedance planimetry and high-frequency ultrasound

1997 ◽  
Vol 35 (1) ◽  
pp. 21-26 ◽  
Author(s):  
J. H. Storkholm ◽  
G. E. Villadsen ◽  
K. Krogh ◽  
C. S. Jørgensen ◽  
H. Gregersen
Keyword(s):  
Mechanical Properties ◽  
High Frequency ◽  
High Frequency Ultrasound ◽  
Impedance Planimetry ◽  
Frequency Ultrasound

scholarly journals A human skin ultrasonic imaging to analyse its mechanical properties

2009 ◽  
pp. 105-116
Author(s):  
Alexandre Delalleau ◽  
Gwendal Josse ◽  
Jérôme George ◽  
Yassine Mofid ◽  
Frédéric Ossant ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
High Frequency ◽  
Complex Structure ◽  
Mechanical Parameters ◽  
High Frequency Ultrasound ◽  
Specific Procedure ◽  
Complex Behaviour ◽  
Behaviour Law ◽  
Frequency Ultrasound

The analysis of the skin mechanical behaviour is a key-point for different field of investigation. As the skin is a complex structure, studies are usually based on inverse methods that compare experimental and finite element numerical results. Besides the considered behaviour law, one of the most important question concerns the geometrical aspects of the skin tissue. In this paper, it is shown how high frequency ultrasound imaging helps the calculation of skin mechanical parameters. The hypodermis influence is firstly discussed through elastographic analyses. A specific procedure to measure the dermis thickness is then proposed to highlight that such a measurement must be considered to draw reliable conclusions. The obtained results are finally discussed to point out the interest of such simplifications for the study of more complex behaviour laws.

Extraction of Mechanical Properties of Articular Cartilage From Osmotic Swelling Behavior Monitored Using High Frequency Ultrasound

2006 ◽  
Vol 129 (3) ◽  
pp. 413-422 ◽  
Author(s):  
Q. Wang ◽  
Y. P. Zheng ◽  
H. J. Niu ◽  
A. F. T. Mak
Keyword(s):  
Mechanical Properties ◽  
Articular Cartilage ◽  
High Frequency ◽  
Weight Bearing ◽  
Ultrasound Measurement ◽  
High Frequency Ultrasound ◽  
Water Fraction ◽  
Layer Interface ◽  
Osmotic Loading ◽  
Frequency Ultrasound

Articular cartilage is a biological weight-bearing tissue covering the bony ends of articulating joints. Negatively charged proteoglycan (PG) in articular cartilage is one of the main factors that govern its compressive mechanical behavior and swelling phenomenon. PG is nonuniformly distributed throughout the depth direction, and its amount or distribution may change in the degenerated articular cartilage such as osteoarthritis. In this paper, we used a 50MHz ultrasound system to study the depth-dependent strain of articular cartilage under the osmotic loading induced by the decrease of the bathing saline concentration. The swelling-induced strains under the osmotic loading were used to determine the layered material properties of articular cartilage based on a triphasic model of the free-swelling. Fourteen cylindrical cartilage-bone samples prepared from fresh normal bovine patellae were tested in situ in this study. A layered triphasic model was proposed to describe the depth distribution of the swelling strain for the cartilage and to determine its aggregate modulus Ha at two different layers, within which Ha was assumed to be linearly dependent on the depth. The results showed that Ha was 3.0±3.2, 7.0±7.4, 24.5±11.1MPa at the cartilage surface, layer interface, and deep region, respectively. They are significantly different (p<0.01). The layer interface located at 70%±20% of the overall thickness from the uncalcified-calcified cartilage interface. Parametric analysis demonstrated that the depth-dependent distribution of the water fraction had a significant effect on the modeling results but not the fixed charge density. This study showed that high-frequency ultrasound measurement together with triphasic modeling is practical for quantifying the layered mechanical properties of articular cartilage nondestructively and has the potential for providing useful information for the detection of the early signs of osteoarthritis.

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