Publications by authors named "Viateur Tuyisenge"

Epilepsy presurgical investigation may include focal intracortical single-pulse electrical stimulations with depth electrodes, which induce cortico-cortical evoked potentials at distant sites because of white matter connectivity. Cortico-cortical evoked potentials provide a unique window on functional brain networks because they contain sufficient information to infer dynamical properties of large-scale brain connectivity, such as preferred directionality and propagation latencies.  Here, we developed a biologically informed modelling approach to estimate the neural physiological parameters of brain functional networks from the cortico-cortical evoked potentials recorded in a large multicentric database.

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In patients with pharmaco-resistant focal epilepsies investigated with intracranial electroencephalography (iEEG), direct electrical stimulations of a cortical region induce cortico-cortical evoked potentials (CCEP) in distant cerebral cortex, which properties can be used to infer large scale brain connectivity. In 2013, we proposed a new probabilistic functional tractography methodology to study human brain connectivity. We have now been revisiting this method in the F-TRACT project (f-tract.

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Objective: Intracranial electroencephalographic (iEEG) recordings contain "bad channels", which show non-neuronal signals. Here, we developed a new method that automatically detects iEEG bad channels using machine learning of seven signal features.

Methods: The features quantified signals' variance, spatial-temporal correlation and nonlinear properties.

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Article Synopsis
  • - The study compared the accuracy of left ventricular systolic performance measurements using a new imaging method called cadmium-zinc-telluride (CZT) semiconductor cameras with traditional methods like echocardiography (echo) and cardiac magnetic resonance (CMR) imaging in patients with myocardial infarction.
  • - 60 patients participated, and all of them underwent echo, CZT-SPECT, and CMR about 6 weeks after their heart attack, focusing on how well the measurements matched, especially the left ventricular ejection fraction (LVEF).
  • - The results showed strong agreement between CZT-SPECT and CMR (r = .79) as well as between CZT-SPECT and echo, indicating that CZ
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This paper presents a new method to estimate left ventricle deformations using variational data assimilation that combines image observations from cine MRI and a dynamic evolution model of the heart. The main contribution of the model is that it embeds parameters modeling the contraction / relaxation process. It estimates myocardial motion and contraction parameters simultaneously, providing accurate complementary information for diagnosis.

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