N. Ayache

Publications799
h-index101
Citations44,207
Highly Influential Citations2,451
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The Multimodal Brain Tumor Image Segmentation Benchmark (BRATS)
TLDR
The set-up and results of the Multimodal Brain Tumor Image Segmentation Benchmark (BRATS) organized in conjunction with the MICCAI 2012 and 2013 conferences are reported, finding that different algorithms worked best for different sub-regions, but that no single algorithm ranked in the top for all sub-Regions simultaneously.
View on IEEE
A Riemannian Framework for Tensor Computing
TLDR
This paper proposes to endow the tensor space with an affine-invariant Riemannian metric and demonstrates that it leads to strong theoretical properties: the cone of positive definite symmetric matrices is replaced by a regular and complete manifold without boundaries, the geodesic between two tensors and the mean of a set of tensors are uniquely defined.
View on Springer
Log‐Euclidean metrics for fast and simple calculus on diffusion tensors
TLDR
A new family of Riemannian metrics called Log‐Euclidean is proposed, based on a novel vector space structure for tensors, which can be converted into Euclidean ones once tensors have been transformed into their matrix logarithms.
View on Wiley
Diffeomorphic demons: Efficient non-parametric image registration
View on Elsevier
Geometric Means in a Novel Vector Space Structure on Symmetric Positive-Definite Matrices
TLDR
This work defines the Log‐Euclidean mean from a Riemannian point of view, based on a lie group structure which is compatible with the usual algebraic properties of this matrix space and a new scalar multiplication that smoothly extends the Lie group structure into a vector space structure.
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Symmetric Log-Domain Diffeomorphic Registration: A Demons-Based Approach
TLDR
This work proposes a non-linear registration algorithm perfectly fit for log-Euclidean statistics on diffeomorphisms that outperforms both the demons algorithm and the recently proposed diffeomorphic demons algorithm in terms of accuracy of the transformation while remaining computationally efficient.
View on PubMed
A Log-Euclidean Framework for Statistics on Diffeomorphisms
TLDR
This article focuses on the computation of statistics of invertible geometrical deformations (i.e., diffeomorphisms), based on the generalization to this type of data of the notion of principal logarithm, which is a simple 3D vector field and well-defined for diffe morphisms close enough to the identity.
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Model-Based Detection of Tubular Structures in 3D Images
TLDR
A new approach for centerline detection and reconstruction of 3D tubular structures and a multiscale analysis for extracting vessels of different sizes according to the scale is presented.
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Spherical Demons: Fast Diffeomorphic Landmark-Free Surface Registration
TLDR
The Spherical Demons algorithm for registering two spherical images is presented and a large class of regularizors for the modified Demons objective function can be efficiently approximated on the sphere using iterative smoothing and the resulting registration is diffeomorphic and fast.
View on IEEE
Reconstructing a 3D structure from serial histological sections
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