Strain Analysis of Left Ventricle by Integrating Finite Element Model and Non-rigid Motion Estimation

A strain analysis approach of the left ventricle （LV） is proposed.In this approach，we can intuitively analyze the strain of the LV during systole.First，we build a3D solid model by utilizing the cardiac magnetic resonance （MR） images，and then construct a3D finite element model.Second，we calculate the correspondence points of element nodes on the finite element model surface by utilizing hybrid unit norma/l Gaussian curvature （UNGCK） algorithm.UNGCK algorithm is a non-rigid motion estimation technique. Lastly，we use α-trimmed means to correct the displacement of the suspicious node.We estimate the strain of the LV by using the knowledge of elasticity and plasticity，and then acquire color cloud pictures of the deformation and strain distribution.Our experiments indicate that the strain analysis approach of the LV can intuitively and effectively reflect the strain distribution and deformation trends of surfaces of the LV during systole.