Deforming a preoperative volume to better represent the intraoperative scene

G P Penney, J A Little, J Weese, D L G Hill, D J Hawkes

Research output: Chapter in Book/Report/Conference proceedingConference paper


Soft-tissue deformation can be a problem if a pre-operative modality is used to help guide a surgical or an interventional procedure. We present a method which can warp a pre-operative CT image to represent the intra-operative scene shown by an interventional fluoroscopy image. The method is a novel combination of a 2D-3D image registration algorithm and a deformation algorithm which allows rigid bodies to be incorporated into a non-linear deformation based on a radial basis function. The 2D-3D registration algorithm is used to obtain information on relative vertebral movements between pre-operative and intra-operative images. The deformation algorithm uses this information to warp the pre-operative image to represent the intra-operative scene more accurately. Images from an aortic stenting procedure were used. The observed deformation was 5 degree flexion and 5 mm lengthening of the lumbar spine. The vertebral positions in the warped CT volume represent the intra-operative scene more accurately than in the pre-operative CT volume. Although we had no gold-standard with which to assess the registration accuracy of soft-tissue structures, the position of soft-tissue structures within the warped CT volume appeared visually realistic. (22 References).
Original languageEnglish
Title of host publicationProceedings of SPIE - the International Society for Optical Engineering
PublisherSPIE-Int. Soc. Opt. Eng.
Pages482 - 492
Number of pages11
Publication statusPublished - 2000
EventMedical Imaging 2000 Conference - San Diego, CA, United States
Duration: 14 Feb 200017 Feb 2000


ConferenceMedical Imaging 2000 Conference
Country/TerritoryUnited States
CitySan Diego, CA


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