Sylvain Faisan
Maître de conférences
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Description des activités
Polarimetric Image Processing
To do
Decomposition of Spectroscopic signal sequences
To do
Retinal Image Registration
To do
Skull Image Analysis
functional MRI -- Brain Connectivity analysis
To do
Functional MRI -- Brain Mapping
Activation detection at voxel v is formulated in terms of temporal alignment between sequences of hemodynamic response onsets detected in the fMRI signal at v and in the spatial neighborhood of v, and the input sequence of stimuli or stimulus onsets. The multiple event sequence alignment problem is solved within the probabilistic framework of hidden Markov multiple event sequence models (HMMESMs). It consists in hypothesizing about a set of valid scenarios that could explain the N observed HRO event sequences. A valid scenario (see Fig. b), relies on the combination of:
* an N + 1th event sequence, namely, a candidate sequence of task-induced hemodynamic activation onsets (HAOs) at the origin of the observations. * HAO signatures, that is, associations of HRO events across channels, each association corresponding to the observable counterpart of a single HAO event. By definition, a
signature is composed of one HRO event by observation channel, the event being observed (black line) or not (black point) (see Fig. b).
* Causality constraints between signatures given an HAO sequence.
Publications
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