Constrained Non-linear Elasticity Reconstruction Technique for Breast MRI Elastography
نویسندگان
چکیده
A. Samani, I. Sack, D. Plewes University of Toronto, Sunnybrook and Women's College Health Sciences Centre, Toronto, Ontario, Canada Synopsis To increase the displacement SNR in breast MR elastography, tissues are compressed significantly. As a result, breast tissues undergo large deformations. This leads to significant geometric and material nonlinearities. In this study, methods for treating these nonlinearities are presented and their impact on elasticity reconstruction is investigated. For elasticity reconstruction, a constrained elastography method is used where tissues are treated as hyperelastic materials. The tissue hyperelastic parameters are calculated using inversion techniques with a nonlinear finite element (FE) model for forward modeling. Simulations indicate the feasibility of reconstructing the tissue hyperelastic parameters using displacement data with moderate SNR.
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