Publications associées à Signal BOLD

Intra and cross-modal negative BOLD response to contrast-varying visual stimuli

Rolf Gruetter, Wietske Van der Zwaag, João Pedro Forjaco Jorge, Patricia Figueiredo

The BOLD contrast is widely used to study brain function. Under externally-applied stimuli, positive BOLD responses (PBR) are generally attributed to local increases in brain activity. Negative BOLD responses (NBR) are also frequently observed, but their u ...

2012

Signal fluctuations in fMRI data acquired with 2D-EPI and 3D-EPI at 7 Tesla

Wietske Van der Zwaag, José Pedro Rebelo Ferreira Marques, João Pedro Forjaco Jorge, Patricia Figueiredo

Segmented three-dimensional echo planar imaging (3D-EPI) provides higher image signal-to-noise ratio (SNR) than standard single-shot two-dimensional echo planar imaging (2D-EPI), but is more sensitive to physiological noise. The aim of this study was to co ...

Elsevier Science Inc2012

Activelets: Wavelets for sparse representation of hemodynamic responses

Michaël Unser, Dimitri Nestor Alice Van De Ville, Ildar Khalidov, François Lazeyras

We propose a new framework to extract the activity-related component in the BOLD functional magnetic resonance imaging (fMRI) signal. As opposed to traditional fMRI signal analysis techniques, we do not impose any prior knowledge of the event timing. Inste ...

Elsevier2011

BOLD responses to trigeminal nerve stimulation

Rolf Gruetter, Carl Petersen, Nathalie Just

The current study investigates a new model of barrel cortex activation using stimulation of the infraorbital branch of the trigeminal nerve. A robust and reproducible activation of the rat barrel cortex was obtained following trigeminal nerve stimulation. ...

2010

Methods for Determining Frequency- and Region-Dependent Relationships Between Estimated LFPs and BOLD Responses in Humans

Jean-Philippe Thiran, Roberto Martuzzi

The relationship between electrophysiological and functional magnetic resonance imaging (fMRI) signals remains poorly understood. To date, studies have required invasive methods and have been limited to single functional regions and thus cannot account for ...

2009

Principles of operation of a DNP prepolarizer coupled to a rodent MRI scanner

Rolf Gruetter, Arnaud Comment, Sami Jannin, Jacques Van Der Klink, Fiodar Kurdzesau

A dynamic nuclear polarization prepolarizer was developed and coupled to a 9.4 T rodent magnetic resonance imaging scanner in order to perform in vivo hyperpolarization experiments. In the present paper, emphasis is put on methods and hardware performance ...

2008

Using forward calculations of the magnetic field perturbation due to a realistic vascular model to explore the BOLD effect

José Pedro Rebelo Ferreira Marques

This paper assesses the reliability of the infinite cylinder model used previously in the literature to simulate blood oxygenation level dependent (BOLD) signal changes. A three-dimensional finite element method was applied to a realistic model of the cort ...

Wiley-Blackwell2008

Design and performance of a DNP prepolarizer coupled to a rodent MRI scanner

Rolf Gruetter, Arnaud Comment, Sami Jannin, Jacques Van Der Klink, Fiodar Kurdzesau

For most of the last forty years, the techniques of Dynamic Nuclear Polarization (DNP) have been confined to particle-physics laboratories building polarized targets, but recently it has been shown that samples similar to a solid target can be transformed ...

2007

Chattez avec Graph Search

Posez n’importe quelle question sur les cours, conférences, exercices, recherches, actualités, etc. de l’EPFL ou essayez les exemples de questions ci-dessous.

AVERTISSEMENT : Le chatbot Graph n'est pas programmé pour fournir des réponses explicites ou catégoriques à vos questions. Il transforme plutôt vos questions en demandes API qui sont distribuées aux différents services informatiques officiellement administrés par l'EPFL. Son but est uniquement de collecter et de recommander des références pertinentes à des contenus que vous pouvez explorer pour vous aider à répondre à vos questions.

Signal BOLD

Intra and cross-modal negative BOLD response to contrast-varying visual stimuli

Signal fluctuations in fMRI data acquired with 2D-EPI and 3D-EPI at 7 Tesla

Activelets: Wavelets for sparse representation of hemodynamic responses

BOLD responses to trigeminal nerve stimulation

Methods for Determining Frequency- and Region-Dependent Relationships Between Estimated LFPs and BOLD Responses in Humans

fMRI at 1.5, 3 and 7 T: characterising BOLD signal changes

Principles of operation of a DNP prepolarizer coupled to a rodent MRI scanner

Using forward calculations of the magnetic field perturbation due to a realistic vascular model to explore the BOLD effect

Dynamics of lactate concentration and blood oxygen level-dependent effect in the human visual cortex during repeated identical stimuli

Design and performance of a DNP prepolarizer coupled to a rodent MRI scanner

Graph Chatbot

Chattez avec Graph Search

Activelets: Wavelets for sparse representation of hemodynamic responses

BOLD responses to trigeminal nerve stimulation

Principles of operation of a DNP prepolarizer coupled to a rodent MRI scanner

Intra and cross-modal negative BOLD response to contrast-varying visual stimuli

fMRI at 1.5, 3 and 7 T: characterising BOLD signal changes

Methods for Determining Frequency- and Region-Dependent Relationships Between Estimated LFPs and BOLD Responses in Humans

Signal fluctuations in fMRI data acquired with 2D-EPI and 3D-EPI at 7 Tesla

Using forward calculations of the magnetic field perturbation due to a realistic vascular model to explore the BOLD effect

Dynamics of lactate concentration and blood oxygen level-dependent effect in the human visual cortex during repeated identical stimuli

Design and performance of a DNP prepolarizer coupled to a rodent MRI scanner