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Wietske Van der Zwaag

Cette personne a quitté l’EPFL

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Publications associées (69)

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EEG-fMRI integration for the study of human brain function

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

Electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) have proved to be extremely valuable tools for the non-invasive study of human brain function. Moreover, due to a notable degree of complementarity between the two modalities, th ...

Elsevier2014

Digit somatotopy in the human cerebellum: A 7T fMRI study

Rolf Gruetter, Olaf Blanke, Wietske Van der Zwaag, José Pedro Rebelo Ferreira Marques, Roberto Martuzzi

The representation of the human body in the human cerebellum is still relatively unknown, compared to the well-studied homunculus in the primary somatosensory cortex. The investigation of the body representation in the cerebellum and its somatotopic organi ...

Academic Press Inc Elsevier Science2013

Comparison of an 8-Channel and a 32-Channel Coil for High-Resolution fMRI at 7 T

Wietske Van der Zwaag, Roy Salomon, Mayur Narsude, Jana Darulová

Multi-channel receive array rf-coils have become widely available for fMRI. The improved SNR and possibility of acquisition acceleration through parallel imaging are especially beneficial for high-resolution studies. In this study, an 8-channel and a 32-ch ...

Springer2014

Investigation of high-resolution functional magnetic resonance imaging by means of surface and array radiofrequency coils at 7 T

Rolf Gruetter, Wietske Van der Zwaag, José Pedro Rebelo Ferreira Marques

In this investigation, high-resolution, 1x1x1-mm(3) functional magnetic resonance imaging (fMRI) at 7 T is performed using a multichannel array head coil and a surface coil approach. Scan geometry was optimized for each coil separately to exploit the stren ...

2009

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, Daniel Gallichan, Mayur Narsude, 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

Ballistocardiogram artifact correction taking into account physiological signal preservation in simultaneous EEG-fMRI

Wietske Van der Zwaag, João Pedro Forjaco Jorge, Patricia Figueiredo, Ana Francisca Leal Silva Soares

The ballistocardiogram (BCG) artifact is currently one of the most challenging in the EEG acquired concurrently with fMRI, with correction invariably yielding residual artifacts and/or deterioration of the physiological signals of interest. In this paper, ...

Elsevier2016

Comparison of three commercially available radio frequency coils for human brain imaging at 3 Tesla

Rolf Gruetter, Wietske Van der Zwaag

Objective To evaluate a transverse electromagnetic (TEM), a circularly polarized (CP) (birdcage), and a 12-channel phased array head coil at the clinical field strength of B (0) = 3T in terms of signal-to-noise ratio (SNR), signal homogeneity, and maps of ...

2008

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

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

High-resolution fMRI at 7T using surface or array rf-coils

Rolf Gruetter, José Pedro Rebelo Ferreira Marques, Wietske Van der Zwaag

2008

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, Cristina Granziera, Kieran O'Brien, Yohan Boillat

SAGE PUBLICATIONS LTD2019

Finger Somatotopic Map in the Human Cerebellum revealed with 7 Tesla fMRI

Rolf Gruetter, Olaf Blanke, José Pedro Rebelo Ferreira Marques, Wietske Van der Zwaag, Roberto Martuzzi

2011

Representation of Sound Objects within Early-Stage Auditory Areas: A Repetition Effect Study Using 7T fMRI

Wietske Van der Zwaag, Stephanie Clarke, Sandra Elisabete Monney, Melissa Saenz

Environmental sounds are highly complex stimuli whose recognition depends on the interaction of top-down and bottom-up processes in the brain. Their semantic representations were shown to yield repetition suppression effects, i. e. a decrease in activity d ...

Public Library of Science2015

Minimization of Nyquist ghosting for echo-planar imaging at ultra-high fields based on a "negative readout gradient" strategy

Rolf Gruetter, Tobias Kober, José Pedro Rebelo Ferreira Marques, Hongxia Lei, Wietske Van der Zwaag, Nathalie Just

Purpose: To improve the traditional Nyquist ghost correction approach in echo planar imaging (EPI) at high fields, via schemes based on the reversal of the EPI readout gradient polarity for every other volume throughout a functional magnetic resonance imag ...

Wiley-Blackwell2009