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José Pedro Rebelo Ferreira Marques

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Related publications (158)

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

Head Motion Detection Using FID Navigators

Rolf Gruetter, Gunnar Krüger, Tobias Kober, José Pedro Rebelo Ferreira Marques

This work explores a concept for motion detection in brain MR examinations using high channel-count RF coil arrays. It applies ultrashort (< 100 mu sec) free induction decay signals, making use of the knowledge that motion induces variations in these signa ...

Wiley-Blackwell2011

Matching Pursuit Iterative Dipole Based Filter of Background Fields in Phase Imaging

Rolf Gruetter, Yves Wiaux, José Pedro Rebelo Ferreira Marques

The information present in the phase of gradient-echo images has opened a new window to look at fine brain anatomy. To obtain high quality phase images depicting small field perturbations produced by tissue susceptibility differences, large slowly spatiall ...

2011

Accelerated MR imaging with spread spectrum encoding

Jean-Philippe Thiran, Pierre Vandergheynst, Dimitri Nestor Alice Van De Ville, Rolf Gruetter, Yves Wiaux, José Pedro Rebelo Ferreira Marques, Gilles Puy

We advocate the use of a novel compressed sensing technique for accelerating the magnetic resonance image acquisition process, coined spread spectrum MR imaging or simply s2MRI. The method resides in pre-modulating the signal of interest by a linear chirp, ...

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

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

On the origin of the MR image phase contrast: An in vivo MR microscopy study of the rat brain at 14.1 T

Rolf Gruetter, José Pedro Rebelo Ferreira Marques, Rajika Maddage

Recent studies at high magnetic fields using the phase of gradient-echo MR images have shown the ability to unveil cortical substructure in the human brain. To investigate the contrast mechanisms in phase imaging, this study extends, for the first time, ph ...

Elsevier2009

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

MP2RAGE contrast optimization at 7T and applications

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

2009

Motion detection using FID navigator signals of MRI coil array elements

Rolf Gruetter, Gunnar Krüger, Tobias Kober, José Pedro Rebelo Ferreira Marques

We propose a motion-detection technique which, in contrast to previously suggested methods, is based on motion-induced free induction decay (FID) signal changes in receive coil arrays with negligible impact on scanning performance. ...

2009

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

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

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

Adaptive FID-navigators for respiration monitoring in multi-slice fMRI applications

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

Functional magnetic resonance imaging (fMRI) measures activation-induced signal changes by means of the blood-oxygenation-level-depended (BOLD) contrast. Since signal changes are typically only 1-3%, the method is intrinsically sensitive to all signal inst ...

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

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José Pedro Rebelo Ferreira Marques

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

Head Motion Detection Using FID Navigators

Matching Pursuit Iterative Dipole Based Filter of Background Fields in Phase Imaging

Accelerated MR imaging with spread spectrum encoding

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

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

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

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

On the origin of the MR image phase contrast: An in vivo MR microscopy study of the rat brain at 14.1 T

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

MP2RAGE contrast optimization at 7T and applications

Motion detection using FID navigator signals of MRI coil array elements

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

Adaptive FID-navigators for respiration monitoring in multi-slice fMRI applications

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

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

Minimization of Nyquist ghosting for fMRI at Ultra-High Fields Based on a ‘negative Read-Out Gradient’

A Continuous Nyquist Ghost Correction for EPI-based fMRI