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Fast, Variable System Delay Correction for Spiral MRI
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DOI：10.1002/mrm.24730.png)
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摘要
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PurposeTime-varying system delays and eddy currents can substantially reduce the image quality of spiral images. A new method is proposed to estimate variable system delays for spiral-based trajectories. MethodsThis approach requires a minor modification of a conventional stack-of-spirals sequence and analyzes data collected on three overlapping orthogonal cylinders. ResultsInitial results are presented for acquired and synthesized phantom data and in vivo data. ConclusionThe proposed method includes gradient coupling effects, requires no phantom measurements or specialized hardware, is robust to off-resonance effects, and estimates independent continuous delays for each gradient channel over the data-sampling period. Magn Reson Med 71:773-782, 2014. (c) 2013 Wiley Periodicals, Inc.
Keyword:
system delays
fast MRI
spiral imaging
k-space trajectory
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IF:
3
论文数:
1.2W
被引数:
3.1W
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