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Wietske Van der Zwaag

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Related publications (69)

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

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

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

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

A 7 tesla FMRI study of amygdala responses to fearful faces

Nouchine Hadjikhani, Wietske Van der Zwaag, Nicole Regula Zürcher Wimmer

The amygdalae are involved in the perception of emotions such as happiness, anger and fear. Because of their proximity to the sinuses, the image signal intensity in T2* weighted fMRI data is often affected by signal loss due to through-slice dephasing, esp ...

2012

The hand representation in the human cerebellum overlaps with the digit representations

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

2012

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

In vivo Structural Imaging of the Cerebellum, the Contribution of Ultra-High Fields

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

This review covers some of the contributions to date from cerebellar imaging studies performed at ultra-high magnetic fields. A short overview of the general advantages and drawbacks of the use of such high field systems for imaging is given. One of the bi ...

Springer-Verlag2012

PACEUP-3DEPI: A highly Accelerated 3D-EPI Sequence for fMRI at 7T

Rolf Gruetter, Wietske Van der Zwaag, Tobias Kober, José Pedro Rebelo Ferreira Marques, Mayur Narsude

2012

Temporal SNR characteristics in segmented 3D-EPI at 7T

Rolf Gruetter, Wietske Van der Zwaag, Gunnar Krüger, Tobias Kober, José Pedro Rebelo Ferreira Marques

Three-dimensional segmented echo planar imaging (3D-EPI) is a promising approach for high-resolution functional magnetic resonance imaging, as it provides an increased signal-to-noise ratio (SNR) at similar temporal resolution to traditional multislice 2D- ...

Wiley-Blackwell2012

Human Primary Auditory Cortex Follows the Shape of Heschl's Gyrus

Stephanie Clarke, Wietske Van der Zwaag, José Pedro Rebelo Ferreira Marques, Melissa Saenz

The primary auditory cortex (PAC) is central to human auditory abilities, yet its location in the brain remains unclear. We measured the two largest tonotopic subfields of PAC (hA1 and hR) using high-resolution functional MRI at 7 T relative to the underly ...

Society for Neuroscience2011

Finger Somatotopy in the Human Cerebellum revealed with fMRI at 7 Tesla

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

2011

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

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

2011

Stimulus duration can change polarity of BOLD response in the amygdalae: a 7T fMRI study

Nouchine Hadjikhani, Wietske Van der Zwaag, Nicole Regula Zürcher Wimmer

2011

MP2RAGE, a self bias-field corrected sequence for improved segmentation and T-1-mapping at high field

Rolf Gruetter, Wietske Van der Zwaag, Gunnar Krüger, Tobias Kober, José Pedro Rebelo Ferreira Marques

The large spatial inhomogeneity in transmit B, field (B-1(+)) observable in human MR images at hi h static magnetic fields (B-0) severely impairs image quality. To overcome this effect in brain T-1-weighted images the, MPRAGE sequence was modified to gener ...

Elsevier2010

Eddy current effects on a clinical 7T-68 cm bore scanner

Rolf Gruetter, Wietske Van der Zwaag, Gunnar Krüger, Tobias Kober, José Pedro Rebelo Ferreira Marques

Eddy currents induced by switching of magnetic field gradients can lead to distortions in short echo-time spectroscopy or diffusion weighted imaging. In small bore magnets, such as human head-only systems, minimization of eddy current effects is more deman ...

2010

Cerebellar Cortical Layers: In Vivo Visualization with Structural High-Field-Strength MR Imaging

Rolf Gruetter, Wietske Van der Zwaag, Gunnar Krüger, José Pedro Rebelo Ferreira Marques, Cristina Granziera

Purpose: To perform in vivo imaging of the cerebellum with an in-plane resolution of 120 mm to observe its cortical granular and molecular layers by taking advantage of the high signal-to-noise ratio and the increased magnetic susceptibility-related contra ...

2010

Where sound position influences sound object representations: A 7-T fMRI study

Stephanie Clarke, Rolf Gruetter, Wietske Van der Zwaag

Evidence from human and non-human primate studies supports a dual-pathway model of audition, with partially segregated cortical networks for sound recognition and sound localisation, referred to as the What and Where processing streams. In normal subjects, ...

Elsevier2010

An EEG homologue of the negative BOLD response as measured at 7 Tesla

Rolf Gruetter, Wietske Van der Zwaag, Micah Murray

2010

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

Comparison Of Single-Shot 2d EPI And Segmented 3d EVI Acquisition For fMRI at 7T

Rolf Gruetter, Wietske Van der Zwaag, Gunnar Krüger, Tobias Kober, José Pedro Rebelo Ferreira Marques

2009

In vivo measurement of glycine with short echo-time H-1 MRS in human brain at 7 T

Rolf Gruetter, Giulio Gambarota, Lijing Xin, Wietske Van der Zwaag, Gunnar Krüger

To determine whether glycine can be measured at 7 T in human brain with H-1 magnetic resonance spectroscopy (MRS). ...

2009

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