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Analysis of shear strain imaging for classifying breast masses: Finite element and phantom results
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10.1118/1.3651461
/content/aapm/journal/medphys/38/11/10.1118/1.3651461
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/11/10.1118/1.3651461

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of RF data acquisition using a linear array transducer with beam steering. Note that z represents the direction of the applied deformation also referred to as the axial direction and x represents the lateral direction, respectively. The beam steered angle for insonification is varied from to . A compression plate larger than the top surface of the phantom is used to provide a uniform deformation.

Image of FIG. 2.
FIG. 2.

Shear strain area mappings demonstrating the region mapped using the normalized axial-shear strain area (NASSA) (truncated from 10 to 30 mm) (a) The normalized shear strain area outside the mass (NASSA_OM) (b) and normalized shear strain area inside the mass (NASSA_ IM) (c) obtained using FEA simulations for an unbound mass with a friction coefficient of 0.2. A 1% shear strain corresponds to 0.01 on the colorbar.

Image of FIG. 3.
FIG. 3.

Shear strain images obtained using FEA simulation (truncated from 10 to 30 mm) (i) and corresponding TM phantom experiments (truncated from 24 to 51 mm) (ii). Comparison of the shear strain patterns obtained using axial-shear (top row) to that obtained with full-shear (bottom row) for elliptical and ellipsoidal inclusions oriented at an angle of 0° (a) and 60° (b) to the applied deformation for different bonding conditions are shown. A 1% shear strain corresponds to 0.01 on the colorbar.

Image of FIG. 4.
FIG. 4.

Plots depicting variations in the NASSA and (a) NFSSA (b) for ellipsoidal inclusions for different threshold values obtained using FEA simulation.

Image of FIG. 5.
FIG. 5.

Plots showing variations in the NASSA (a) and NFSSA (b) feature values for ellipsoidal inclusions with different b/a value obtained using FEA simulation.

Image of FIG. 6.
FIG. 6.

Plots showing the impact of various stiffness ratio values on the NASSA (a) and NFSSA (b), respectively.

Image of FIG. 7.
FIG. 7.

Impact of applied deformation on NASSA (a) and NFSSA (b).

Image of FIG. 8.
FIG. 8.

Plots demonstrating the impact of inclusion orientation to the applied deformation for both FEA simulations (top row or i) and experimental TM phantom results (bottom row or ii). Column (a) demonstrates the variations in the NASSA feature values while column (b) presents the same for the NFSSA feature values. The error bars denote the standard deviation of the mean feature value estimated from ten independent sets of RF data acquired on the TM phantoms.

Image of FIG. 9.
FIG. 9.

Plots demonstrating the impact of inclusion orientation to the applied deformation with and without shearing strains within the inclusion for both FEA simulation (i) and experimental TM phantom results (ii). Column (a) demonstrates the variations in the NASSA feature values while column (b) presents NFSSA feature values. The error bars the standard deviation of the mean feature value estimated from ten independent sets of RF data acquired on the TM phantoms.

Tables

Generic image for table
TABLE I.

Young’s Modulus values of the TM phantom materials and their respective Modulus contrasts.

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/content/aapm/journal/medphys/38/11/10.1118/1.3651461
2011-10-24
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Analysis of shear strain imaging for classifying breast masses: Finite element and phantom results
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/11/10.1118/1.3651461
10.1118/1.3651461
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