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Content Provider | IEEE Xplore Digital Library |
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Author | Havel, W.J. Nyenhuis, J.A. Bourland, J.D. Foster, K.S. Geddes, L.A. Graber, G.P. Waninger, M.S. Schaefer, D.J. |
Copyright Year | 1965 |
Abstract | In magnetic (eddy-current) stimulation, sensory and motor nerve are stimulated by a time-varying magnetic field (dB/dt) produced in an appropriate coil. In this study, magnetic stimulation thresholds for a solenoidal coil encircling the forearm were determined in 14 healthy human volunteers, 11 males and 3 females. Damped sinusoidal dB/dt pulses with durations (onset to zero crossing) ranging from 120 /spl mu/s to 2500 /spl mu/s were produced by discharging a capacitor bank into the coil. Rectangular dB/dt pulses with durations ranging from 50 /spl mu/s to 2500 /spl mu/s were generated by a Gradient Ramp Accelerator Module (GRAM) in series with a linear amplifier. The threshold data were fitted to an equivalent circuit underlying the hyperbolic form of the strength-duration curve. Average electric field rheobases for the sinusoidal and rectangular pulses were 5.87 V/m and 5.36 V/m, respectively; chronaxies for these waveforms were 393 /spl mu/s and 395 /spl mu/s, respectively. This study shows that stimulation thresholds obtained with damped sinusoidal dB/dt pulses can be used to accurately predict the thresholds that would be obtained for rectangular waveforms. |
Sponsorship | IEEE Magnetics Society |
Starting Page | 4269 |
Ending Page | 4271 |
Page Count | 3 |
File Size | 374671 |
File Format | |
ISSN | 00189464 |
Volume Number | 33 |
Issue Number | 5 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 1997-09-01 |
Publisher Place | U.S.A. |
Access Restriction | One Nation One Subscription (ONOS) |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Magnetic stimulation Coils Pulse amplifiers Capacitors Humans Inductance Magnetic sensors Pulse generation Linear accelerators Biomedical engineering |
Content Type | Text |
Resource Type | Article |
Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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