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

Publications associées (42)

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BPX-preconditioning for isogeometric analysis

Annalisa Buffa

We consider elliptic PDEs (partial differential equations) in the framework of isogeometric analysis, i.e., we treat the physical domain by means of a B-spline or NURBS mapping which we assume to be regular. The numerical solution of the PDE is computed by ...

2013

Local Excitation of Magnetostatic Modes in YIG

Jean-Philippe Ansermet, Elisa Papa

Described are ferromagnetic resonance (FMR) studies of the long wavelength magnetostatic wave modes of a single crystal yttrium iron garnet (YIG) slab magnetized by an in-plane field. A resonant circuit comprising a coil, 50 m in diameter, is used to excit ...

Institute of Electrical and Electronics Engineers2013

Second order proton traps for multi-nuclear RF coils: Applied for 13C MRS in humans at 7T

Rolf Gruetter

The concept of second order proton traps (consisting of an inductor and two capacitors) in coils for non-proton NMR allows control over the resonance frequency, the blocking frequency and the trap mode frequency. Effective proton traps with relatively high ...

2011

A numerical method for the optimal control of switched systems

Maryam Kamgarpour

Switched dynamical systems have shown great utility in modeling a variety of systems. Unfortunately, the determination of a numerical solution for the optimal control of such systems has proven difficult, since it demands optimal mode scheduling. Recently, ...

IEEE2010

Improved magnetization transfer in solid-state NMR with fast magic angle spinning

Geoffrey Bodenhausen

The efficiency of magnetization transfer between different spins S such as chemically inequivalent carbon-13 nuclei in solid samples that are spinning at high frequencies about the magic angle can be enhanced by a phase-alternated recoupling irradiation sc ...

Elsevier2009

Bayesian Experimental Design of Magnetic Resonance Imaging Sequences

Matthias Seeger

We show how improved sequences for magnetic resonance imaging can be found through optimization of Bayesian design scores. Combining approximate Bayesian inference and natural image statistics with high-performance numerical computation, we propose the fir ...

2009

A single-chip array of NMR receivers

Giovanni Boero, Jens Anders, Paul Sangiorgio

We present the first single-chip array of integrated NMR receivers for parallel spectroscopy and imaging. The array, optimized for operation at 300 MHz, is composed of eight separate channels, with each channel consisting of a detection coil, a tuning capa ...

2009

Motion detection using FID navigator signals of MRI coil array elements

Rolf Gruetter, 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

An exact solution for ideal dam-break floods on steep slopes

Christophe Ancey, Martin Rentschler

Dam-break floods on steep slopes occur in diverse settings. They may result from failure of either natural or man-made dams, and they have been responsible for the loss of thousands of lives [Costa, 1988]. Recent disasters resulting from dam-break floods o ...

American Geophysical Union2008

Process for the fabrication of hollow core solenoidal microcoils in borosilicate glass

Mona Julia Katharina Klein

We report the fabrication of solenoidal microcoils with hollow core embedded within two 100 µm thick borosilicate glass wafers. The main process steps are the reactive ion etching of borosilicate glass, anodic wafer bonding, copper metal organic chemical v ...

Institute of Physics2008