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Reducing gradient imperfections for spiral magnetic resonance spectroscopic imaging

✍ Scribed by Dong-Hyun Kim; Daniel M. Spielman

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
591 KB
Volume
56
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

Spiral k‐space magnetic resonance spectroscopic imaging (MRSI) requires high performance from gradient hardware systems. During the readout phase, oscillating gradients are continuously played out, which can cause undesired effects. These effects on the quality of SI data are non‐intuitive because of their time‐varying nature. In this work we describe the effects of undesirable gradient performance on SI. Measurements of the true readout trajectories were performed and the results were then used in the reconstruction process. The effects of these imperfections resulted in a spatially and spectrally varying amplitude and frequency modulation. The use of the measured trajectories in the reconstruction process yielded an up to 20% increase in signal amplitude recovery. Magn Reson Med, 2006. Β© 2006 Wiley‐Liss, Inc.

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