1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Estimating the viscoelastic modulus of a thrombus using an ultrasonic shear-wave approach
Rent:
Rent this article for
USD
10.1118/1.4794493
/content/aapm/journal/medphys/40/4/10.1118/1.4794493
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/4/10.1118/1.4794493

Figures

Image of FIG. 1.
FIG. 1.

Illustration of SDUV. A shear wave is created by a focused ultrasound beam, and its propagation is detected by a second transducer. The propagation speed of the shear wave is measured by its phase change over a certain distance along the propagation direction.

Image of FIG. 2.
FIG. 2.

Illustration of the experimental-system setup.

Image of FIG. 3.
FIG. 3.

Particle displacements as functions of time for phantoms constructed from 3%, 5%, and 7% gelatin. The measurements were made 4 mm from the vibration center.

Image of FIG. 4.
FIG. 4.

Phase changes as functions of distance for 5%-gelatin phantoms at harmonic frequencies from 30 to 240 Hz. The symbols represent the mean values of the measurements and the lines indicate linear regressions.

Image of FIG. 5.
FIG. 5.

Shear-wave propagation speeds measured from 30 to 240 Hz for phantoms constructed from 3%, 5%, and 7% gelatin. The mean and SD values of four independent measurements are shown as symbols and error bars, respectively. The lines are curves fitting Eq. (1) , which give the values of shear elastic modulus μ 1 and viscosity μ 2 for each measurement.

Image of FIG. 6.
FIG. 6.

Particle displacements as functions of the time for blood clots with hematocrits of 3%, 20%, and 40%. The measurements were made 4 mm from the vibration center.

Image of FIG. 7.
FIG. 7.

Shear-wave propagation speeds measured from 30 to 240 Hz for blood clots with hematocrits of 3%, 20%, and 40%. The mean and SD values of four independent measurements are shown as symbols and error bars, respectively. The lines are curves fitting Eq. (1) , which give the values of shear elastic modulus μ 1 and viscosity μ 2 for each measurement.

Tables

Generic image for table
TABLE I.

Values of shear modulus and viscosity for phantoms constructed from gelatin at different concentrations estimated using SDUV and ESM. The probability values from t-tests between the two approaches are also listed. Data are mean ± SD values.

Generic image for table
TABLE II.

Values of shear modulus and viscosity for blood clots with different hematocrits estimated using SDUV and ESM. The probability values from t-tests between the two approaches are also listed.

Loading

Article metrics loading...

/content/aapm/journal/medphys/40/4/10.1118/1.4794493
2013-03-15
2014-04-24
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Estimating the viscoelastic modulus of a thrombus using an ultrasonic shear-wave approach
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/4/10.1118/1.4794493
10.1118/1.4794493
SEARCH_EXPAND_ITEM