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Automatic Point Landmark Matching for Regularizing Nonlinear Intensity Registration: Application to Thoracic CT Images

  • Martin Urschler
  • Christopher Zach
  • Hendrik Ditt
  • Horst Bischof
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4191)

Abstract

Nonlinear image registration is a prerequisite for a variety of medical image analysis tasks. A frequently used registration method is based on manually or automatically derived point landmarks leading to a sparse displacement field which is densified in a thin-plate spline (TPS) framework. A large problem of TPS interpolation/approximation is the requirement for evenly distributed landmark correspondences over the data set which can rarely be guaranteed by landmark matching algorithms. We propose to overcome this problem by combining the sparse correspondences with intensity-based registration in a generic nonlinear registration scheme based on the calculus of variations. Missing landmark information is compensated by a stronger intensity term, thus combining the strengths of both approaches. An explicit formulation of the generic framework is derived that constrains an intra-modality intensity data term with a regularization term from the corresponding landmarks and an anisotropic image-driven displacement regularization term. An evaluation of this algorithm is performed comparing it to an intensity- and a landmark-based method. Results on four synthetically deformed and four clinical thorax CT data sets at different breathing states are shown.

Keywords

Regularization Term Point Landmark Nonlinear Registration Intensity Registration Landmark Match 
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 Urschler
    • 1
  • Christopher Zach
    • 2
  • Hendrik Ditt
    • 3
  • Horst Bischof
    • 1
  1. 1.Institute for Computer Graphics & VisionGraz University of TechnologyAustria
  2. 2.VRVis Research CentreGrazAustria
  3. 3.Siemens Medical Solutions, CTE PAForchheimGermany

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