Section: Software

Symmetric Log-Domain Diffeomorphic Image Registration Software

Participants : Florence Dru [ Correspondant ] , Tom Vercauteren.

This work has been done in collaboration with Mauna Kea Technologies, Paris, France.

An open-source ITK implementation of the symmetric log-domain diffeomorphic demons algorithm has been provided [77] . This algorithm generalizes Thirion's demons and the diffeomorphic demons algorithm. The main practical advantages of the symmetric demons [118] with respect to the other demons variants is that is provides the inverse of the spatial transformation at no additional computational cost and ensures that the registration of image A to image B provides the inverse of the registration from image B to image A. The algorithm works completely in the log-domain, i.e. it uses a stationary velocity field to encode the spatial transformation as its exponential. Within the Insight Toolkit (ITK), the classical demons algorithm is implemented as part of the finite difference solver framework. The provided code reuses and extends this generic framework. The source code is composed of a set of reusable ITK filters and classes. A program that allows the user to run different variants of the demons algorithm has also been made available.