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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Sekino, M. Ohsaki, H. Yamaguchi-Sekino, S. Ueno, S. |
| Copyright Year | 1965 |
| Abstract | Detection of weak magnetic fields arising from neuronal electrical activities using magnetic-resonance imaging (MRI) is a potentially effective method for functional imaging of the brain. The purpose of this study is to theoretically and experimentally assess the influence of neuronal magnetic fields on magnetic-resonance signals. The neuronal magnetic field was modeled by using a current dipole formula, and the resulting magnetic-resonance signals were calculated for a voxel located close to the dipole. A current dipole strength of 12 nAmiddotm resulted in the maximum signal drop of 0.6%. In the experiments, magnetic-resonance images of the rat brain were obtained by using a 4.7-T MRI system. A pair of electrodes was attached to the left sciatic nerve for electric stimulation. Images were obtained at ten time points of 0, 30, 60, ..., and 270 ms after the electric stimulation. In the right somatosensory cortex, a transient decrease in the signal intensity was found at 0-30 ms after the stimulation, which was attributed to the effects of neuronal magnetic fields. A neuronal activation map was generated by a comparison of signal intensities between the images obtained at 30-60 ms and 60-90 ms. The right somatosensory cortex exhibited a statistically significant difference in these two groups of images. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 4841 |
| Ending Page | 4844 |
| Page Count | 4 |
| File Size | 425214 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 45 |
| Issue Number | 10 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2009-10-01 |
| 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 resonance imaging Magnetic field measurement Magnetic fields Neurons Biomedical imaging Spatial resolution Biomedical engineering Signal generators Blood flow Scalp rat Brain magnetic-resonance imaging (MRI) neuron |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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