DocumentCode :
1704425
Title :
Evaluation of hierarchical elastic medical image registration method
Author :
Xu, Xiaoyan ; Dony, Robert D.
Author_Institution :
Sch. of Eng., Guelph Univ., Ont., Canada
Volume :
3
fYear :
2004
Firstpage :
1289
Abstract :
The paper investigates the hierarchical approach to elastic medical image registration based on mutual information (MI) (Likar, B. and Pernus, F., Image and Vision Computing, vol.19, p.33-44, 2001), in which images are progressively subdivided, locally registered, and elastically interpolated using a thin-plate spline. The technique has been shown to be efficient and robust with small local transformations. However, problems do exist with this technique. First, MI is a statistical property of the two images, so the reduction in the number of samples due to the partitioning of the images into smaller sub-images reduces the statistical quality of the joint intensity histogram. Also, the partitioning scheme may lose some important information, such as edges, which lie exactly on the partition. The statistical problem of MI is resolved by resampling and combining with global MI. An overlapping scheme is implemented in which the image is subdivided into sub-images which overlap their neighbours. This helps to overcome the edge problems. Experiments show that these two methods can improve the registration results to some limited extent (PSNR) and the visual result is much better, especially for the overlapping window scheme.
Keywords :
image registration; image sampling; interpolation; medical image processing; splines (mathematics); statistical analysis; PSNR; elastic interpolation; hierarchical elastic image registration method; image sampling; joint intensity histogram; medical image registration; mutual information; overlapping scheme; statistical property; thin-plate spline; Biomedical engineering; Biomedical imaging; Deformable models; Histograms; Image registration; Mutual information; PSNR; Robustness; Spline; Testing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical and Computer Engineering, 2004. Canadian Conference on
ISSN :
0840-7789
Print_ISBN :
0-7803-8253-6
Type :
conf
DOI :
10.1109/CCECE.2004.1349634
Filename :
1349634
Link To Document :
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