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Peripheral nerve stimulation-optimal gradient waveform design
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DOI：10.1002/mrm.25440.png)
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摘要
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PurposeModern magnetic resonance imaging scanners with high-performance gradient systems have high maximum gradient strength (G(max)) and slew rate (S-max). Peripheral nerve stimulation (PNS) is often a more limiting factor for gradient waveform design than G(max) and S-max. Traditionally, the slew rate is derated globally to adhere to PNS limitations. MethodsIn this work, the PNS limitation is already included in the gradient waveform design in the form of a time-varying slew rate, hence shortening the overall gradient duration. ResultsSpiral and echo-planar imaging trajectories were designed with a multitude of parameters, and it was demonstrated that trajectory durations from conventional to PNS-optimal design can be shortened by 8 and 3%, respectively. ConclusionIncluding PNS-limits in the gradient waveform design can shorten the duration of gradient trajectories, thereby reducing associated artifacts. Magn Reson Med 74:518-522, 2015. (c) 2014 Wiley Periodicals, Inc.
Keyword:
peripheral-nerve stimulation
peripheral nerve stimulation convolution model
echo-planar imaging
spiral imaging
time-optimal gradient-trajectory design
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期刊
IF:
3
论文数:
1.2W
被引数:
3.1W
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