Tobias Kober

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Publications associées (151)

Structural Magnetic Resonance Imaging : Motion Correction and Improvement Strategies

Tobias Kober

Notwithstanding its great success in diagnostic routine and research, structural magnetic resonance imaging (MRI) still faces challenges. In this context, the present thesis studies new approaches to mitigate the motion susceptibility of MRI. Furthermore, ...

EPFL2011

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

Who said fat is bad? Skull-stripping benefits from additional fat image

Reto Meuli, Delphine Ribes Lemay, Gunnar Krüger, Tobias Kober

Being a preliminary step for many clinical applications and analyses, accurate skull-stripping is a key challenge in MR brain imaging. One of its major difficulties arises from the contrast similarities at brain/non-brain tissue interfaces, in particular b ...

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

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

A Continuous Nyquist Ghost Correction for EPI-based fMRI

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

2008

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