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New CTA Protocol and 2D-3D Registration Method for Liver Catheterization

  • Martin Groher
  • Nicolas Padoy
  • Tobias F. Jakobs
  • Nassir Navab
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4190)

Abstract

2D-3D registration for angiographic liver interventions is an unsolved problem mainly because of two reasons. First, a suitable protocol for Computed Tomography Angiography (CTA) to contrast liver arteries is not used in clinical practice. Second, an adequate registration algorithm which addresses the difficult task of aligning deformed vessel structures has not been developed yet. We address the first issue by introducing an angiographic CT scanning phase and thus create a strong link between radiologists and interventionalists. The scan visualizes arteries similar to the vasculature captured with an intraoperative C-arm acquiring Digitally Subtracted Angiograms (DSAs). Furthermore, we propose a registration algorithm using the new CT phase that aligns arterial structures in two steps: a) Initialization of one corresponding feature using vessel diameter information, b) optimization on three rotational and one translational parameter to register vessel structures that are represented as centerline graphs. We form a space of good features by iteratively creating new graphs from projected centerline images and by restricting the correspondence search only on branching points (the vertices) of the vessel tree. This algorithm shows good convergence and proves to be robust against deformation changes, which is demonstrated through studies on one phantom and three patients.

Keywords

Root Mean Square Compute Tomography Angiography Iterative Close Point Vessel Structure Vessel Tree 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Martin Groher
    • 1
  • Nicolas Padoy
    • 1
  • Tobias F. Jakobs
    • 2
  • Nassir Navab
    • 1
  1. 1.Chair for Computer Aided Medical Procedures (CAMP)Technische Universität MünchenGermany
  2. 2.Institute for Clinical RadiologyUniversity of Munich, Grosshadern Hospital 

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