Fast voxel-based 2D/3D registration algorithm using a rendering method based on the shear-warp factorization

Juergen Weese, Roland GOECKE, Graeme P. Penney, Paul Desmedt, Thorsten Buzug

Research output: A Conference proceeding or a Chapter in BookConference contributionpeer-review

43 Citations (Scopus)


2D/3D registration makes it possible to use pre-operative CT scans during X-ray fluoroscopy guided interventions for navigation purposes. For this registration task a fast voxel-based method is presented, which uses a recently introduced similarity measure (pattern intensity). This measure is especially suitable for 2D/3D registration, because it is robust with respect to structures as, for instance, a stent visible in the X-ray fluoroscopy image but not in the CT scan. The method uses only a part of the CT scan for the generation of digitally reconstructed radiographs (DRRs) to accelerate their computation. Nevertheless, computation time is crucial for intra-operative application, because numerous DRRs must be computed. The suitability of different volume rendering methods for 2D/3D registration has been investigated therefore. A method based on the shear-warp factorization turned out to be especially suitable and builds the basis of the registration algorithm. The algorithm has been applied to images of a spine phantom and to clinical images. For comparison, registration results have been calculated using ray-casting. The shear-warp factorization based rendering method accelerates registration by a factor of up to seven compared to ray-casting without degrading registration accuracy. Using a vertebra as a feature for registration, computation time is in the range of 3-4s (Sun UltraSparc, 300MHz) which is acceptable for intra-operative application.
Original languageEnglish
Title of host publicationMedical Imaging 1999: Image Processing
Subtitle of host publicationProceedinsg of SPIE
EditorsKenneth M. Hanson
PublisherSPIE - International Society for Optical Engineering
Number of pages9
ISBN (Print)9780819477606
Publication statusPublished - 1999
Externally publishedYes


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