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Proceedings Paper

Deforming a preoperative volume to better represent the intraoperative scene
Author(s): Graeme P. Penney; John A. Little; Juergen Weese; Derek L.G. Hill; David John Hawkes
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Paper 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.

Paper Details

Date Published: 6 June 2000
PDF: 11 pages
Proc. SPIE 3979, Medical Imaging 2000: Image Processing, (6 June 2000); doi: 10.1117/12.387709
Show Author Affiliations
Graeme P. Penney, Guy's Hospital/Guy's, King's, and St. Thomas' School of Medicine (United Kingdom)
John A. Little, Guy's Hospital/Guy's, King's, and St. Thomas' School of Medicine (United Kingdom)
Juergen Weese, Philips Research Labs. (Germany)
Derek L.G. Hill, Guy's Hospital/Guy's, King's, and St. Thomas School of Medicine (United Kingdom)
David John Hawkes, Guy's Hospital/Guy's, King's, and St. Thomas' School of Medicine (United Kingdom)


Published in SPIE Proceedings Vol. 3979:
Medical Imaging 2000: Image Processing
Kenneth M. Hanson, Editor(s)

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