Graphic processing unit-accelerated mutual information-based 3D image rigid registration |
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| Authors: | Guanhua Li Zongying Ou Tieming Su Jun Han |
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| Institution: | 1. Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China
2. Dalian Modem High-Tech Development Co. Ltd., Dalian 116021, China |
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| Abstract: | Mutual information (MI)-based image registration is effective in registering medical images, but it is computationally expensive.
This paper accelerates MI-based image registration by dividing computation of mutual information into spatial transformation
and histogram-based calculation, and performing 3D spatial transformation and trilinear interpolation on graphic processing
unit (GPU). The 3D floating image is downloaded to GPU as flat 3D texture, and then fetched and interpolated for each new
voxel location in fragment shader. The transformed results are rendered to textures by using frame buffer object (FBO) extension,
and then read to the main memory used for the remaining computation on CPU. Experimental results show that GPU-accelerated
method can achieve speedup about an order of magnitude with better registration result compared with the software implementation
on a single-core CPU. |
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| Keywords: | image registration mutual information graphic processing unit(GPU) |
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