Elastic Medical Image Registration Based on Spring Mass System

On medical image registration,the source image is first Delaunay triangulated,and then modeled as a spring mass system.The system deforms under the influence of forces derived from gradient of the mutual information registration criterion,while specific geometrical structures are restricted to predefined shapes.When the mesh vertices reach equilibrium,each Delaunay triangle undertakes a local affine transformation.Experimental results show that the algorithm may be used to register both intro-modality and intermodality images,and control the deformation rapidly and precisely.