Peripheral nerve stimulation‐optimal gradient waveform design. Issue 2 (28th August 2014)

• Record Type: Journal Article
• Authors: Schulte, Rolf F.; Noeske, Ralph
• Is Part Of: Magnetic resonance in medicine. Volume 74:Issue 2(2015:Aug.)
• Page Start: 518
• Page End: 522
• Publication Date: 2014-08-28
• Subjects: Nuclear magnetic resonance -- Periodicals; Electron paramagnetic resonance -- Periodicals; 616.07548
• DOI: 10.1002/mrm.25440
• Languages: English
• ISSNs: 0740-3194

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="mrm25440-sec-0001" sec-type="section"> <title>Purpose</title> <p>Modern magnetic resonance imaging scanners with high‐performance gradient systems have high maximum gradient strength (<italic>G</italic>_max) and slew rate (<italic>S</italic>_max). Peripheral nerve stimulation (PNS) is often a more limiting factor for gradient waveform design than <italic>G</italic>_max and <italic>S</italic>_max. Traditionally, the slew rate is derated globally to adhere to PNS limitations.</p> </sec> <sec id="mrm25440-sec-0002" sec-type="section"> <title>Methods</title> <p>In 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.</p> </sec> <sec id="mrm25440-sec-0003" sec-type="section"> <title>Results</title> <p>Spiral 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.</p> </sec> <sec id="mrm25440-sec-0004" sec-type="section"> <title>Conclusion</title> <p>Including 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. © 2014 Wiley Periodicals, Inc.</p> </sec> </abstract>