Neuronal current distribution imaging using magnetic resonance

Hirotake Kamei; Keiji Iramina; Koki Yoshifcawa; Shoogo Ueno

doi:10.1109/20.800771

Neuronal current distribution imaging using magnetic resonance

Hirotake Kamei, Keiji Iramina, Koki Yoshifcawa, Shoogo Ueno

Research output: Contribution to journal › Article › peer-review

68 Citations (Scopus)

Abstract

A new functional magnetic resonance imaging (fMRI) technique to visualize the distribution of neuronal currents in the human brain was developed Measurements of the internal magnetic field deformation caused by an electric current dipole in a phantom were performed using a method based on the microscopic magnetic resonance imaging technique. The minimal value of the current dipole moment detected by the present method was determined to be 90 nAm. The technique was applied to obtain maps of human brain activity by using motor andsensory stimulus paradigms. Measurements were made with an EPI sequence at 1.5T. Intensity changes, resulting from causes other than neuronal currents, were eliminated by editing functional images obtained with field gradients of different polarities. MRI mapping of the neuronal currents in the brain during middle finger and thumb tapping was clearly obtained,.

Original language	English
Pages (from-to)	4109-4111
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	35
Issue number	5 PART 2
DOIs	https://doi.org/10.1109/20.800771
Publication status	Published - 1999
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/20.800771

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AU - Kamei, Hirotake

AU - Iramina, Keiji

AU - Yoshifcawa, Koki

AU - Ueno, Shoogo

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Y1 - 1999

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AB - A new functional magnetic resonance imaging (fMRI) technique to visualize the distribution of neuronal currents in the human brain was developed Measurements of the internal magnetic field deformation caused by an electric current dipole in a phantom were performed using a method based on the microscopic magnetic resonance imaging technique. The minimal value of the current dipole moment detected by the present method was determined to be 90 nAm. The technique was applied to obtain maps of human brain activity by using motor andsensory stimulus paradigms. Measurements were made with an EPI sequence at 1.5T. Intensity changes, resulting from causes other than neuronal currents, were eliminated by editing functional images obtained with field gradients of different polarities. MRI mapping of the neuronal currents in the brain during middle finger and thumb tapping was clearly obtained,.

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Neuronal current distribution imaging using magnetic resonance

Abstract

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