Elastic Registration of Medical Image Using B-Spline
SONG Xiangfen
LIN Shiling
SONG Lei
LI Wen
Abstract：In order to solve deformation or deviation on medical image, Free-form Deformation (FFD) based on the B-Spline was used as the registration algorithm, which established a grid consisting of control points that is applied to the moving image to obtain the initial control grid parameters.Gradient descent measure was used as the optimize algorithm and sum of squared differences measure was used as the similarity measure to revise the parameters constantly.The change of parameters would cause pixel points in the nearest 4×4 unit control grids to move and the coordinate position after moving were gotten by B-Spline interpolation.Bilinear interpolation was used as the interpolation algorithm to calculate the grayscale value in the position.The position in the moved image relatively was equivalent to that in the fixed image mapped by the pixel point before moving.It would get best image registration result when the gray difference degree reached the minimum between the two corresponding positions respectively in the moved image and fixed image.Experiment results shows that it can get satisfactory registration result, thus verify the algorithm in this paper is effective.
Keywords：Elastic registrationB-SplineFree-form deformationGradient descent measureSum of squared differences measure
Publication Date：2017-01-01
Online Publishing Date：2026-09-11(First online date of this platform, not the publication date of the document)
Pages：5( 213-217 )