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- Iman Aganj, Christophe Lenglet, Guillermo Sapiro, Essa Yacoub, Kamil Ugurbil, Noam Harel
- Magnetic resonance in medicine
- 2010

q-Ball imaging is a high-angular-resolution diffusion imaging technique that has been proven very successful in resolving multiple intravoxel fiber orientations in MR images. The standard computation of the orientation distribution function (the probability of diffusion in a given direction) from q-ball data uses linear radial projection, neglecting the… (More)

- Kamil Ugurbil, Junqian Xu, +24 authors Essa Yacoub
- NeuroImage
- 2013

The Human Connectome Project (HCP) relies primarily on three complementary magnetic resonance (MR) methods. These are: 1) resting state functional MR imaging (rfMRI) which uses correlations in the temporal fluctuations in an fMRI time series to deduce 'functional connectivity'; 2) diffusion imaging (dMRI), which provides the input for tractography… (More)

- S N Sotiropoulos, S Moeller, +10 authors C Lenglet
- Magnetic resonance in medicine
- 2013

PURPOSE
To examine the effects of the reconstruction algorithm of magnitude images from multichannel diffusion MRI on fiber orientation estimation.
THEORY AND METHODS
It is well established that the method used to combine signals from different coil elements in multichannel MRI can have an impact on the properties of the reconstructed magnitude image.… (More)

- Stamatios N. Sotiropoulos, Saâd Jbabdi, +13 authors Timothy Edward John Behrens
- NeuroImage
- 2013

The Human Connectome Project (HCP) is a collaborative 5-year effort to map human brain connections and their variability in healthy adults. A consortium of HCP investigators will study a population of 1200 healthy adults using multiple imaging modalities, along with extensive behavioral and genetic data. In this overview, we focus on diffusion MRI (dMRI)… (More)

- Emmanuel Caruyer, Christophe Lenglet, Guillermo Sapiro, Rachid Deriche
- Magnetic resonance in medicine
- 2013

PURPOSE
In diffusion MRI, a technique known as diffusion spectrum imaging reconstructs the propagator with a discrete Fourier transform, from a Cartesian sampling of the diffusion signal. Alternatively, it is possible to directly reconstruct the orientation distribution function in q-ball imaging, providing so-called high angular resolution diffusion… (More)

- Iman Aganj, Christophe Lenglet, Guillermo Sapiro
- ISBI
- 2009

Q-ball imaging (QBI) is a high angular resolution diffusion imaging (HARDI) technique which has been proven very successful in resolving multiple intravoxel fiber orientations in MR images. The standard computation of the orientation distribution function (ODF, the probability of diffusion in a given direction) from q-ball uses linear radial projection,… (More)

- Alvina Goh, Christophe Lenglet, Paul M. Thompson, René Vidal
- 2009 IEEE Conference on Computer Vision and…
- 2009

High angular resolution diffusion imaging has become an important magnetic resonance technique for in vivo imaging. Most current research in this field focuses on developing methods for computing the orientation distribution function (ODF), which is the probability distribution function of water molecule diffusion along any angle on the sphere. In this… (More)

- Christophe Lenglet, Mikaël Rousson, Rachid Deriche, Olivier D. Faugeras
- Journal of Mathematical Imaging and Vision
- 2006

This paper is dedicated to the statistical analysis of the space of multivariate normal distributions with an application to the processing of Diffusion Tensor Images (DTI). It relies on the differential geometrical properties of the underlying parameters space, endowed with a Riemannian metric, as well as on recent works that led to the generalization of… (More)

- Christophe Lenglet, Mikaël Rousson, Rachid Deriche
- IEEE Trans. Med. Imaging
- 2006

We address the problem of the segmentation of cerebral white matter structures from diffusion tensor images (DTI). A DTI produces, from a set of diffusion-weighted MR images, tensor-valued images where each voxel is assigned with a 3 x 3 symmetric, positive-definite matrix. This second order tensor is simply the covariance matrix of a local Gaussian… (More)

- An T. Vu, Edward J. Auerbach, +6 authors Kamil Ugurbil
- NeuroImage
- 2015

Mapping structural connectivity in healthy adults for the Human Connectome Project (HCP) benefits from high quality, high resolution, multiband (MB)-accelerated whole brain diffusion MRI (dMRI). Acquiring such data at ultrahigh fields (7T and above) can improve intrinsic signal-to-noise ratio (SNR), but suffers from shorter T2 and T2(⁎) relaxation times,… (More)