A NORMALIZATION METHOD FOR AXIAL-SHEAR STRAIN ELASTOGRAPHY
L.Chen, R.J. Housden, G.M. Treece, A.H. Gee and R.W. Prager
The axial-shear strain distribution of soft tissue contains information useful for differentiating benign and malignant tumours. This paper describes a novel axial-shear strain normalization method. The algorithm builds on an existing normalization procedure for axial strain in order to map the shear strain values to the range [-pi/2, pi/2]. The normalized shear data do not change sign with the direction of axial probe motion and therefore can be time averaged without loss of information. Experiments in simulation, in vitro and in vivo confirm the advantages of normalization. The proposed method is well suited to freehand strain imaging and enables the visualization of subtle slip patterns around inclusions.
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