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Peripheral nerve stimulation in a whole-body echo-planar imaging system

✍ Scribed by James C. Ehrhardt; Chin-S Lin; Vincent A. Magnotta; David J. Fisher; William T. C. Yuh

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
588 KB
Volume
7
Category
Article
ISSN
1053-1807

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✦ Synopsis

Abstract

Echo‐planar techniques in MRI use a rapidly oscillating frequency‐encoding gradient with the potential to produce peripheral nerve stimulation. To evaluate the incidence, type, and location of stimulation in a commercial whole‐body scanner, we studied two groups: (a) 173 consecutive individuals scanned by echo‐planar imaging for other purposes and (b) seven subjects who were scanned with an extensive set of 36 echo‐planar sequences (with prompting after each scan to report any peripheral nerve stimulation) to test the effects of various parameters. Although only 5% of group A reported symptoms of peripheral nerve stimulation, all in group B experienced some type of stimulation, dependent primarily on direction of the oscillating gradient and location of the body within the gradient coil. Maximum stimulation typically occurred 30 to 40 cm from isocenter in the region of maximum dB/dt. Generally, y gradients produced truncal stimulation, and x gradients produced stimulation in the head. When hands were clasped over the abdomen, a tingling in the hands occasionally was felt. Patients should be instructed to keep their hands apart.

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