2014
Free-form deformation using lower-order B-spline for nonrigid image registration
Publication
Publication
In traditional free-form deformation (FFD) based registration, a B-spline basis function is commonly utilized to build the transformation model. As the B-spline order increases, the corresponding B-spline function becomes smoother. However, the higher-order B-spline has a larger support region, which means higher computational cost. For a given D-dimensional nth-order B-spline, an mth-order B-spline where (m ≤ n) has (m+1/n+1)D times lower computational complexity. Generally, the third-order B-spline is regarded as keeping a good balance between smoothness and computation time. A lower-order function is seldom used to construct the deformation field for registration since it is less smooth. In this research, we investigated whether lower-order B-spline functions can be utilized for efficient registration, by using a novel stochastic perturbation technique in combination with a postponed smoothing technique to higher B-spline order. Experiments were performed with 3D lung and brain scans, demonstrating that the lower-order B-spline FFD in combination with the proposed perturbation and postponed smoothing techniques even results in better accuracy and smoothness than the traditional third-order B-spline registration, while substantially reducing computational costs.
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doi.org/10.1007/978-3-319-10404-1_25, hdl.handle.net/1765/90068 | |
Organisation | Erasmus MC: University Medical Center Rotterdam |
Sun, W., Niessen, W., & Klein, S. (2014). Free-form deformation using lower-order B-spline for nonrigid image registration. doi:10.1007/978-3-319-10404-1_25 |