Abstract
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 language | English |
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Title of host publication | Proceedings of SPIE - the International Society for Optical Engineering |
Publisher | SPIE-Int. Soc. Opt. Eng. |
Pages | 482 - 492 |
Number of pages | 11 |
Publication status | Published - 2000 |
Event | Medical Imaging 2000 Conference - San Diego, CA, United States Duration: 14 Feb 2000 → 17 Feb 2000 |
Conference
Conference | Medical Imaging 2000 Conference |
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Country/Territory | United States |
City | San Diego, CA |
Period | 14/02/2000 → 17/02/2000 |