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Application of a spatial transformation method based on stretching to digital subtraction angiography registration(PDF)

Journal of Shenzhen University Science and Engineering[ISSN:1000-2618/CN:44-1401/N]

2005 No.2
Research Field:


Application of a spatial transformation method based on stretching to digital subtraction angiography registration
CHU Ying1;TANG Chaolun1;JI Zhen1; MOU Xuanqin2 and CAI Yuanlong2
1)College of Information Engineering Shenzhen University Shenzhen 518060 P. R. China;
2)College of Electronic and Information Engineering Xi’an Jiaotong University Xi’an 710049 P.R. China
digital subtraction angiography (DSA) image registration motion estimation spatial transformation stretching mapping gray-level interpolation
TP 391. 41
A spatial transformation based on stretching gives superior initial registration of digital subtraction angiography (DSA ) images. It reduces artifacts caused by motion displacement. The spatial transformation method is more effective than traditional linear transformation methods. Results show that the quality of DSA images after registration is improved significantly. Block matching was used to calculate the motion displacement of each pixel in a given DSA image. Computational overhead was reduced by calculating only reference points as control points for block matching. The remaining pixels in the DSA image were mapped by spatial transformation and gray-level interpolation of the calculated reference points. This spatial transformation method based on stretching solves unexpected ill-behaved solutions common to traditional linear space transformations. Mathematical analysis of this stretching based space transformation likens it to a nonlinear but rational transformation. Investigation confirms this spatial transformation method to be simpler and more efficient than linear transformation methods. Motion displacement is better compensated and the quality of DSA images is significantly improved with this method.