Publications de Yohan Boillat | EPFL Graph Search

Whole-body somatotopic maps in the cerebellum revealed with 7T fMRI

The cerebellum is known to contain a double somatotopic body representation. While the anterior lobe body map has shown a robust somatotopic organization in previous fMRI studies, the representations in the posterior lobe have been more difficult to observ ...

2020

Laminar analysis of the cerebellar cortex shows widespread damage in early MS patients: A pilot study at 7T MRI

Yohan Boillat

Background To date, little is known about the presence and extent of cerebellar cortical pathology in early stages of MS. ...

SAGE PUBLICATIONS INC2020

Metabolic and hemodynamic changes in the activated human brain and cerebellar organisation measured by MRS/MRl at 7 Tesla

Yohan Boillat

Although less often investigated than the positive blood-oxygen-level-dependent (BOLD) signal, a negative BOLD signal has also been observed under certain conditions, which could have a neuronal origin. To further investigate the negative BOLD signal from ...

EPFL2020

Cortical laminar assessment of T1 and T2*in the cerebellum of MS patients and controls at 7T MRI

Wietske Van der Zwaag, Yohan Boillat, Cristina Granziera

WILEY2019

Metabolite concentration changes associated with positive and negative BOLD responses in the human visual cortex: A functional MRS study at 7 Tesla

Rolf Gruetter, Lijing Xin, Wietske Van der Zwaag, Yohan Boillat

Negative blood oxygenation-level dependent (BOLD) signal observed during task execution in functional magnetic resonance imaging (fMRI) can be caused by different mechanisms, such as a blood-stealing effect or neuronal deactivation. Electrophysiological re ...

2019

Cerebellar cortical laminar analysis of T1 relaxation times at 7T MRI shows widespread cerebellar cortex damage in early relapsing-remitting MS patients but no correlation with clinical deficits

Wietske Van der Zwaag, Yohan Boillat, Cristina Granziera, Kieran O'Brien

SAGE PUBLICATIONS LTD2019

Whole brain measurements of the positive BOLD response variability during a finger tapping task at 7 T show regional differences in its profiles

Wietske Van der Zwaag, Yohan Boillat

PURPOSE: The positive BOLD response can vary across brain regions. Here, the positive BOLD responses of motor regions, including the cerebellum, were investigated by fast fMRI acquisition. METHODS: The participants were asked to perform an event-related fi ...

Wiley2019

Surface-based characteristics of the cerebellar cortex visualized with ultra-high field MRI

Guillaume Bonnier, Wietske Van der Zwaag, Gunnar Krüger, Yohan Boillat, Cristina Granziera, Kieran O'Brien, Mario Joao Fartaria de Oliveira

Although having a relatively homogeneous cytoarchitectonic organization, the cerebellar cortex is a heterogeneous region characterized by different amounts of myelin, iron and protein expression profiles. In this study, we used quantitative T1 and T2* mapp ...

2018

Metabolite concentration changes during increase of the BOLD signal in the human visual cortex: a functional magnetic resonance spectroscopy study at 7T

Rolf Gruetter, Lijing Xin, Wietske Van der Zwaag, Yohan Boillat

Sage Publications Inc2017