Peripheral nerve stimulation-optimal gradient waveform design
Peripheral nerve stimulation-optimal gradient waveform design
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DOI：
10.1002/mrm.25440
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发表时间：
2015-08-01
影响因子：
3.3
通讯作者：
Noeske, Ralph
中科院分区：
文献类型：
--
作者：
Schulte, Rolf F.;Noeske, Ralph
现代磁共振成像扫描仪具有高性能梯度系统，具有高的最大梯度强度（G（max））和转换速率（S-max）。外周神经刺激（PNS）通常是比G（max）和S-max更限制梯度波形设计的因素。传统上，转换速率被降低到全局遵守PNS limitations.MethodsIn这项工作中，PNS限制已经包括在梯度波形设计中的形式，随时间变化的转换速率，从而缩短整体梯度duration.ResultsSpiral和回波平面成像轨迹被设计与众多的参数，结果表明，从常规设计到最优设计的弹道持续时间可以缩短8%和3%，结论在梯度波形设计中包括PNS限制可以缩短梯度轨迹的持续时间，从而减少相关伪影。Magn Reson Med 74：518-522，2015. (c)2014 Wiley Periodicals，Inc.
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.