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Table 1 Overview of the registration strategies

From: Effects of rigid and non-rigid image registration on test-retest variability of quantitative [18F]FDG PET/CT studies

  Registration   Input for registration
Transformation Program Similarity measure Input data Focus
Rigid Elastix SSD PET Global
   NCC   Semi-local
   MI   Local
  RegisRigid SSD NAC Global
   NCC   Semi-local
   MI   Local
Non-rigid Elastix SSD CT Global
   NCC   Semi-local
   MI   Local
  splineMIRIT SSD CTPETa Global
   NCC   Semi-local
   MI   Local
  1. aCTPET is used for non-rigid registrations only; SSD = summed squared differences; NCC = normalized cross correlation; MI = mutual information