Publications de Olivier Benoit Thomas Reynaud

Resting-state functional connectivity abnormalities in subjective cognitive decline: A 7T MRI study

Olivier Benoit Thomas Reynaud, Ileana Ozana Jelescu

Resting-state functional connectivity (FC) MRI is sensitive to brain changes in Alzheimer's disease in preclinical stages, however studies in persons with subjective cognitive decline (SCD) have reported conflicting findings, and no study is available at 7 ...

2024

Brainstem Correlates of a Cold Pressor Test Measured by Ultra-High Field fMRI

Dimitri Nestor Alice Van De Ville, Fatma Megdiche, Olivier Benoit Thomas Reynaud, Domenica Bueti

Introduction Modern imaging techniques such as blood oxygen level-dependent (BOLD) functional magnetic resonance imaging (fMRI) allow the non-invasive and indirect measurement of brain activity. Whether changes in signal intensity can be detected in small ...

2020

Multi-slice passband bSSFP for human and rodent fMRI at ultra-high field

Rolf Gruetter, Rodrigo Araujo Fraga Da Silva, Olivier Benoit Thomas Reynaud, Ileana Ozana Jelescu

Balanced steady-state free precession (bSSFP) can be used as an alternative to gradient-echo (GE) EPI for BOLD functional MRI when image distortions and signal drop-outs are severe such as at ultra-high field. However, 3D-bSSFP acquisitions have distinct d ...

Academic Press Inc - Elsevier Science2019

Processing pathways for emotional vocalizations

Stephanie Clarke, Olivier Benoit Thomas Reynaud

Emotional sounds are processed within a large cortico-subcortical network, of which the auditory cortex, the voice area, and the amygdala are the core regions. Using 7T fMRI, we have compared the effect of emotional valence (positive, neutral, and negative ...

2019

High spatio-temporal resolution in functional MRI with 3D echo planar imaging using cylindrical excitation and a CAIPIRINHA undersampling pattern

Wietske Van der Zwaag, José Pedro Rebelo Ferreira Marques, Mayur Narsude, Daniel Gallichan, Olivier Benoit Thomas Reynaud

The combination of 3D echo planar imaging (3D-EPI) with a 2D-CAIPIRINHA undersampling scheme provides high flexibility in the optimization for spatial or temporal resolution. This flexibility can be increased further with the addition of a cylindrical exci ...

Wiley2018

Time-Dependent Diffusion MRI in Cancer: Tissue Modeling and Applications

Olivier Benoit Thomas Reynaud

In diffusion weighted imaging (DWI), the apparent diffusion coefficient (ADC) has been recognized as a useful and sensitive surrogate for cell density, paving the way for non-invasive tumor staging, and characterization of treatment efficacy in cancer. How ...

Frontiers Research Foundation2017

Influence of physiological noise on accelerated 2D and 3D resting state functional MRI data at 7 T

Rolf Gruetter, Wietske Van der Zwaag, José Pedro Rebelo Ferreira Marques, João Pedro Forjaco Jorge, Olivier Benoit Thomas Reynaud

Physiological noise often dominates the blood-oxygen level-dependent (BOLD) signal fluctuations in high-field functional MRI (fMRI) data. Therefore, to optimize fMRI protocols, it becomes crucial to investigate how physiological signal fluctuations impact ...

Wiley-Blackwell2017

T1 mapping of the mouse brain following fractionated manganese administration using MP2RAGE

Florent Eggenschwiler, Nathalie Just, Carola Jaquelina del Carmen Romero, Luc Driencourt, Mario Gaetano Lepore, Olivier Benoit Thomas Reynaud

With the increasing development of transgenic mouse models of neurodegenerative diseases allowing improved understanding of the underlying mechanisms of these disorders, robust quantitative mapping techniques are also needed in rodents. MP2RAGE has shown g ...

Springer Heidelberg2017

Fast low-specific absorption rate B0-mapping along projections at high field using two-dimensional radiofrequency pulses

Rolf Gruetter, Benoît Schaller, Daniel Gallichan, Olivier Benoit Thomas Reynaud

Purpose At 7 Tesla (T), conventional static field (B0) projection mapping techniques, e.g., FASTMAP, FASTESTMAP, lead to elevated specific absorption rates (SAR), requiring longer total acquisition times (TA). In this work, the series of adiabatic pulses n ...

Wiley-Blackwell2015