TY - JOUR
T1 - Shear strain estimation and lesion mobility assessment in elastography
AU - Konofagou, Elisa E.
AU - Harrigan, Tim
AU - Ophir, Jonathan
N1 - Funding Information:
This work was supported in part by NIH Program Project Grant P01-CA64597. The authors would also like to thank Brian Garra for his input and the aquisition of the in vivo data.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2000/3
Y1 - 2000/3
N2 - Elastography typically measures and images the normal strain component along the insonification/compression axis, i.e, in the axial direction. We have recently shown that, by using interpolation and cross-correlation methods of transversely displaced RF echo segments, it is possible to measure and image displacement and strain transversely to the beam with good precision. This enables the estimation and imaging of all three principal normal strain components. Generally, motion in a direction other than that in which strain is estimated may result in decorrelation noise, severely corrupting the estimates. Therefore, a correction method is applied to correct the displacement and strain estimates for decorrelating motion. In this paper, we show how corrected displacement estimates can also be used to estimate and image the shear strain components. This may allow us to identify regions of decorrelation noise in the normal strain measurement that are due to shear strain. Shear strain estimates provide supplementary information, which can characterize different tissue elements based on their mobility. In the case of breast lesions, low mobility is related to malignancy. Following an in vivo case, we show with 2D simulations how assessment of tumor mobility can be achieved with shear strain estimation.
AB - Elastography typically measures and images the normal strain component along the insonification/compression axis, i.e, in the axial direction. We have recently shown that, by using interpolation and cross-correlation methods of transversely displaced RF echo segments, it is possible to measure and image displacement and strain transversely to the beam with good precision. This enables the estimation and imaging of all three principal normal strain components. Generally, motion in a direction other than that in which strain is estimated may result in decorrelation noise, severely corrupting the estimates. Therefore, a correction method is applied to correct the displacement and strain estimates for decorrelating motion. In this paper, we show how corrected displacement estimates can also be used to estimate and image the shear strain components. This may allow us to identify regions of decorrelation noise in the normal strain measurement that are due to shear strain. Shear strain estimates provide supplementary information, which can characterize different tissue elements based on their mobility. In the case of breast lesions, low mobility is related to malignancy. Following an in vivo case, we show with 2D simulations how assessment of tumor mobility can be achieved with shear strain estimation.
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U2 - 10.1016/S0041-624X(99)00125-0
DO - 10.1016/S0041-624X(99)00125-0
M3 - Article
C2 - 10829696
AN - SCOPUS:0033879472
SN - 0041-624X
VL - 38
SP - 400
EP - 404
JO - Ultrasonics
JF - Ultrasonics
IS - 1
ER -