Spiral Scan Peripheral Nerve Stimulation

King, Kevin F.; Schaefer, Daniel J.

doi:10.1002/1522-2586(200007)12:1<164::aid-jmri18>3.0.co;2-r

Cited by 14 publications

(13 citation statements)

References 13 publications

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“…; [4] where N denotes the number of spiral interleaves and FOV the spatial field of view. The design problem is essentially how to choose h(t) as a function of time while sampling k-space as rapidly as possible under given constraints.…”

Section: Spiralsmentioning

confidence: 99%

Peripheral nerve stimulation‐optimal gradient waveform design

Schulte

Noeske

2014

Magnetic Resonance in Med

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Section: Spiralsmentioning

confidence: 99%

Peripheral nerve stimulation‐optimal gradient waveform design

Schulte

Noeske

2014

Magnetic Resonance in Med

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“…It is equipped with high‐performance gradients, which can operate at 700 T/m/s simultaneously with an 80‐mT/m maximum gradient amplitude on each gradient axis . Typical whole‐body MR scanners offer up to a 200‐T/m/s gradient slew rate, and their performance may be further limited because of concerns about peripheral nerve stimulation (PNS) . The C3T can apply higher slew rates and gradient amplitudes because PNS is reduced because of its smaller bore diameter of 37 cm.…”

Section: Introductionmentioning

confidence: 99%

“…[18][19][20][21][22][23] Typical whole-body MR scanners offer up to a 200-T/m/s gradient slew rate, and their performance may be further limited because of concerns about peripheral nerve stimulation (PNS). 24 The C3T can apply higher slew rates and gradient amplitudes because PNS is reduced because of its smaller bore diameter of 37 cm. Its 26-cm diameter of spherical volume is suitable for imaging heads, extremities, and infants.…”

Section: Introductionmentioning

confidence: 99%

The effect of spiral trajectory correction on pseudo‐continuous arterial spin labeling with high‐performance gradients on a compact 3T scanner

Kang

Yarach

et al. 2019

Magnetic Resonance in Med

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Purpose To demonstrate the feasibility of pseudo‐continuous arterial‐spin–labeled (pCASL) imaging with 3D fast‐spin‐echo stack‐of‐spirals on a compact 3T scanner (C3T), to perform trajectory correction for eddy‐current–induced deviations in the spiral readout of pCASL imaging, and to assess the correction effect on perfusion‐related images with high‐performance gradients (80 mT/m, 700T/m/s) of the C3T. Methods To track eddy‐current–induced artifacts with Archimedean spiral readout, the spiral readout in pCASL imaging was performed with 5 different peak gradient slew rate (Smax) values ranging from 70 to 500 T/m/s. The trajectory for each Smax was measured using a dynamic field camera and applied in a density‐compensated gridding image reconstruction in addition to the nominal trajectory. The effect of the trajectory correction was assessed with perfusion‐weighted (ΔM) images and proton‐density–weighted images as well as cerebral blood flow (CBF) maps, obtained from 10 healthy volunteers. Results Blurring artifact on ΔM images was mitigated by the trajectory correction. CBF values on the left and right calcarine cortices showed no significant difference after correction. Also, the signal‐to‐noise ratio of ΔM images improved, on average, by 7.6% after correction (P < .001). The greatest improvement of 12.1% on ΔM images was achieved with a spiral readout using Smax of 300~400 T/m/s. Conclusion Eddy currents can cause spiral trajectory deviation, which leads to deformation of the CBF map even in cases of low value Smax. The trajectory correction for spiral‐readout–based pCASL produces more reliable results for perfusion imaging. These results suggest that pCASL is feasible on C3T with high‐performance gradients.

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“…The fast switching gradient fields are applied for spatial encoding of the MRI signal and can cause peripheral nerve stimulation and implant heating. They are also responsible for the noise in the MRI scanner room, which can reach levels of 100 dB or more and potentially lead to hearing damages [74,119–121,118,122–126,30,31,127,128,16,90,129,37,130–133,57,58,134,135,69]. …”

Section: Magnetic Fields In An Mri Suitementioning

confidence: 99%

Magnetic resonance safety

Sammet

2016

Abdom Radiol

137

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Magnetic Resonance Imaging (MRI) has a superior soft-tissue contrast compared to other radiological imaging modalities and its physiological and functional applications have led to a significant increase in MRI scans worldwide. A comprehensive MRI safety training to protect patients and other healthcare workers from potential bio-effects and risks of the magnetic fields in an MRI suite is therefore essential. The knowledge of the purpose of safety zones in an MRI suite as well as MRI appropriateness criteria is important for all healthcare professionals who will work in the MRI environment or refer patients for MRI scans. The purpose of this article is to give an overview of current magnetic resonance safety guidelines and discuss the safety risks of magnetic fields in an MRI suite including forces and torque of ferromagnetic objects, tissue heating, peripheral nerve stimulation and hearing damages. MRI safety and compatibility of implanted devices, MRI scans during pregnancy and the potential risks of MRI contrast agents will also be discussed and a comprehensive MRI safety training to avoid fatal accidents in an MRI suite will be presented.

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Spiral Scan Peripheral Nerve Stimulation

Cited by 14 publications

References 13 publications

Peripheral nerve stimulation‐optimal gradient waveform design

Peripheral nerve stimulation‐optimal gradient waveform design

The effect of spiral trajectory correction on pseudo‐continuous arterial spin labeling with high‐performance gradients on a compact 3T scanner

Magnetic resonance safety

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