PMID: 9543420Apr 16, 1998Paper

Gradient characterization using a Fourier-transform technique

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
M T AlleyN J Pelc

Abstract

This paper describes a technique for characterizing the gradient subsystem of a magnetic resonance (MR) system. The technique uses a Fourier-transform analysis to directly measure the k-space trajectory produced by an arbitrary gradient waveform. In addition, the method can be easily extended to multiple dimensions and can be adapted to measuring residual gradient effects such as eddy currents. Several examples of gradient waveform and eddy-current measurements are presented. Also, it is demonstrated how the eddy-current measurements can be parameterized with an impulse-response formalism for later use in system tuning. When compared to a peak-fitting analysis, this technique provides a more direct extraction of the k-space measurements, which reduces the possibility of analysis error. This approach also has several advantages as compared to the conventional eddy-current measurement technique, including the ability to measure very short time constant effects.

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Citations

Feb 20, 1999·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·E Adalsteinsson, D M Spielman
Aug 10, 1999·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·E AdalsteinssonD M Spielman
Oct 9, 2001·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·A Ebel, A A Maudsley
Dec 18, 2001·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·A EbelA A Maudsley
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Feb 20, 2003·Magnetic Resonance Imaging·Shantanu SarkarXiaoping Hu
Jul 11, 2003·Journal of Magnetic Resonance·David J GoodyearBruce J Balcom
Aug 31, 2004·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Bassem HibaAnne Ziegler
Dec 4, 2003·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Bassem HibaAnne Ziegler
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May 19, 2009·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Christoph BarmetKlaas P Pruessmann
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Apr 9, 2009·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Hao Tan, Craig H Meyer
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Feb 25, 2009·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Sonal JosanKim Butts Pauly
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Apr 27, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Bertram J WilmKlaas P Pruessmann
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Apr 19, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Dirk MayerAdolf Pfefferbaum
Jan 22, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Pekka SipiläFlorian Wiesinger
Jun 1, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Ryan K RobisonJames G Pipe
Mar 20, 2013·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Payal S BhavsarJames G Pipe
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