Xavier Pennec


Demonology: contributions to the Demons' image registration algorithm

Image registration consists in finding the geometric transformation that best superimposes the homologous points (voxels for 3D images) of two images. Originally proposed by Jean-Philippe Thirion in 1998 as an efficient procedure for non-linear registration, the demons' algorithm was revisited during 20 years.

Explanation as an alternated direction minimization method

With Pascal Cathier, we recast the demons as an alternated direction minimization method. This gave rise to Pascal's pair and smooth (PASHA) method.

Publications

Diffeomorphic demons

With Tom Vercauteren, we adapted the efficient optimization procedure to work on a space of diffeomorphic transformations. Experiments show that the diffeomorphic demons results are similar in terms of image similarity metric, but more regular and closer to the true transformation in controlled experiments, particularly in terms of Jacobian.

Publications

Software

Log demons in the SVF framework

The parametrization of diffeomorphisms by the flow of stationnary velocity fields (the SVF framework for diffeomorphism) was introduced at MICCAI 2006 by Arsigny. Combined with the BCF formula proposed by Bossa at MICCAI 2007, this led to a new formulation of the demons which optimizes directly the SVF parameterizing the deformation. This new parameterization allows to obtain inverse consistency very easily, and opens the way to a sound statistical setting for deformation-based morphometry.

Publications

Software


[Home page] [Asclepios team home page]


Xavier Pennec