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European Journal of Nuclear Medicine

, Volume 26, Issue 7, pp 718–733 | Cite as

A multivariate approach to registration of dissimilar tomographic images

  • Jesper Leif Roger Andersson
  • Lennart Thurfjell
Original article

Abstract

We devised a method to allow for retrospective registration of tomographic images with very different information content, the main emphasis being on sets of positron emission tomography images obtained with different tracers. A multivariate cost-function based on information theory was used as an index of ”goodness-of-alignment”. The cost-function makes no assumptions regarding the form of the relationship between the two image sets, and is hence very general. Image volumes, with known relative spatial orientation, were simulated for tracers with different uptake patterns and the method was validated by assessing its ability to recover these known orientations. The method was able to recover the known transformations with an accuracy of about 1 mm and 1° along and around all axes, even for tracer combinations with radically different uptake patterns and with large initial misalignment. With the suggested method it is feasible to retrospectively align examinations obtained with different tracers and/or modalities.

Key words: Registration Positron emission tomography Multivariate Mutual information 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • Jesper Leif Roger Andersson
    • 1
  • Lennart Thurfjell
    • 2
  1. 1.Uppsala University PET Centre, Uppsala University, Uppsala, SwedenSE
  2. 2.Centre for Image Analysis, Uppsala University, Uppsala, SwedenSE

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