Publication

Motion detection using FID navigator signals of MRI coil array elements

Publications associées (31)

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

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

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

Quantitative imaging of flux vortices in the type-II superconductor MgB2 using cryo-Lorentz transmission electron microscopy

Marco Cantoni, Mathieu Julien Gino Cottet, Cécile Hébert, Duncan Thomas Lindsay Alexander, Fabrizio Carbone, Janusz Andrzej Karpinski

Imaging of flux vortices in high quality MgB2 single crystals has been successfully performed in a commercial field-emission gun-based transmission electron microscope. In cryo-Lorentz microscopy, the sample quality and the vortex lattice can be monitored ...

Amer Physical Soc2013

Magnetization transfer-based 3D visualization of foot peripheral nerves

Giulio Gambarota, Bénédicte Marie Maréchal, Gunnar Krüger, Cristina Granziera

PURPOSE: To investigate magnetization transfer (MT) effects as a new source of contrast for imaging and tracking of peripheral foot nerves. MATERIALS AND METHODS: Two sets of 3D spoiled gradient-echo images acquired with and without a saturation pulse were ...

Wiley-Blackwell2013

A dual-axis pointing mirror with moving-magnet actuation

Nico de Rooij, Wilfried Noell, Caglar Ataman, Sébastien Lani

A large-aperture and large-angle MEMS-based 2D pointing mirror is presented. The device is electromagnetically actuated by a moving-magnet/stationary-coil pair and potentially suited for high power laser beam shaping and beam pointing applications, such as ...

Institute of Physics2013

Methods for Molecular Magnetic Resonance Imaging and Magnetic Resonance Spectroscopy using Hyperpolarized Nuclei

Riccardo Balzan

Since the introduction 10 years ago of the dissolution method, Dynamic Nuclear Polarization (DNP) became a widely applied and powerful technique to enhance nuclear magnetic resonance (NMR) signals of low naturally abundant, insensitive nuclear spins for an ...

EPFL2013

Fluorine-19 Magnetic Resonance Angiography of the Mouse

Yves Pilloud, Ruud van Heeswijk

Purpose: To implement and characterize a fluorine-19 (F-19) magnetic resonance imaging (MRI) technique and to test the hypothesis that the F-19 MRI signal in steady state after intravenous injection of a perfluoro-15-crown-5 ether (PCE) emulsion may be exp ...

Public Library of Science2012

Prospective and retrospective motion correction in diffusion magnetic resonance imaging of the human brain

Rolf Gruetter, Gunnar Krüger, Tobias Kober

Diffusion-weighting in magnetic resonance imaging (MRI) increases the sensitivity to molecular Brownian motion, providing insight in the micro-environment of the underlying tissue types and structures. At the same time, the diffusion weighting renders the ...

Elsevier2012

Toward Reliable MR-Based Brain Structure Morphometry : Importance of Rigorous Quality Control

Bénédicte Marie Maréchal

Dementing neurodegenerative disorders have more and more prominent public health implications with the most frequent cause being the currently non reversible Alzheimer's Disease (AD). However, over the past 15 years, an abundant literature has demonstrated ...

EPFL2011

Proton traps for multi-nuclear RF coils: design analysis and practical implementation for 13C MRS in humans at 7T

Rolf Gruetter

Trapped coil designs allow the operation of lower-frequency coils in the presence of a proton coil. Adding a second capacitor to a trap in the non-proton RF coil allows control over the trap reactance at the low and high frequency (here 13C and 1H) and the ...

2011

Electroacoustic absorbers II: implementation of a digital synthetic admittance for controlling the dynamics of electroacoustic absorbers

Hervé Lissek, Romain Boulandet, Etienne Thierry Jean-Luc Rivet

This paper discusses the implementation of a synthetic electrical admittance for controlling the dynamics of electroacoustic absorbers. Indeed, different basic control techniques are capable of varying the acoustic impedance of an electroacoustic transduce ...

2011

Nonuniform and coherent motion of superconducting vortices in the picometer-per-second regime

Helmuth Berger, Hui Wang

We investigated vortex dynamics in a single-crystal sample of type-II superconductor NbSe2 using scanning tunneling microscopy at 4.2 K. The decay of the magnetic field at a few nT/s in our superconducting magnet induced the corresponding motion of vortice ...

2011