The Multidimensional Brain

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Conférence Neurospin

Lundi 1 juin 2017 - 11h00 Amphi NeuroSpin, Centre d’études de Saclay, Gif-sur-Yvette

« Dynamic MRI image reconstruction using adaptive regularization methods »

Pr Jeffrey Fessler, William L. Root Collegiate Professor of EECS, Univ. Michigan, USA

Abstract :
Dynamic MRI image reconstruction is an inherently under-determined inverse problem because the object is changing as the data is collected. (There is no such thing as ``fully sampled data’’ in dynamic MRI). The ill-posed nature of dynamic MRI requires some form of regularization (signal models) to distinguish among candidate solutions. Traditional k-space data sharing methods (like keyhole imaging) use implicit signal models, whereas modern regularized methods use explicit signal models. Typical regularization methods are based on simple mathematic signal models such as wavelets. This talk will focus on newer methods that are adaptive, where the signal model is learned either from training data or concurrently with reconstruction of the dynamic image sequence.
This is joint work with Sai Ravishankar.

 


Lundi 22 mai 2017 - 11h00, NeuroSpin salle 183, Centre d’études de Saclay, Gif-sur-Yvette

« The neural fingerprints of a missing hand - brain organisation and plasticity in amputees »

Tamar MAKIN, Institute of Cognitive Neuroscience, University College London

Abstract :
Following arm-amputation brain areas that previously operated the hand will become “freed-up” to work for other body parts. This process of brain plasticity is widely held to result in the experience of phantom limb pain (pain that is perceived to be arising from the missing hand), and is therefore considered to be maladaptive. I will present evidence to challenge this prevalent view, and instead demonstrate that representation of the missing hand persists decades after amputation. I will show that the cortical resources of the missing hand can be used by a multitude of body parts, and even artificial limbs. Based on this evidence, I suggest that plasticity in amputees is experience-dependant, and is not inherently maladaptive.

Agenda

  • Thursday 1 June 11:00-12:30 - Pr Jeffrey Fessler - William L. Root Collegiate Professor of EECS, Univ. Michigan, USA

    Dynamic MRI image reconstruction using adaptive regularization methods

    Résumé : Conférence Neurospin

    Lieu : Neurospin - Amphi Neurospin CEA Gif-sur-Yvette


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