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Estimation of Induced Eddy Current in the Brain and Characteristics of Nerve Excitation by Magnetic Stimulation

Research Project

Project/Area Number 07680949
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Biomedical engineering/Biological material science
Research InstitutionKagoshima University

Principal Investigator

YUNOKUCHI Kazutomo  Kagoshima University, Faculty of Engineering, Assosiate Professor, 工学部, 助教授 (10094187)

Co-Investigator(Kenkyū-buntansha) KAMEYAMA Masaki  Faculty of Medicine Kagoshima University Professor, 医学部, 教授 (60150059)
TANAKA Tetsuro  Faculty of Engineering Kagoshima University Assosiate Professor, 工学部, 助教授 (50217048)
YOSHIDA Hiroshi  Faculty of Engineering Kagoshima University Professor, 工学部, 教授 (20037849)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1995: ¥800,000 (Direct Cost: ¥800,000)
Keywordsmagnetic stimulation / distributions of induced eddy current / cranium model / bull frog's sciatic nerve / arm tank model
Research Abstract

In recent years, the contactless and non-invasive magnetic stimulation is used to diagnose the function of nerve in the clinical application. In magnetic stimulation, it is important for clarifying the location of nerve excitation to estimate the distributions of induces eddy current in a living body. It is, however, difficult to predict distributions of induced eddy currents in an inhomogeneous medium like as the humanbrain. In order to investigate the characteristics of induced eddy currents in the cranium, the distributions of induced eddy current in the simple cranium model which is filled with the saline solution was measured by the probe made of a thin flexible mini coaxial cable. Moreover, the estimation of the stimulated point in the nerve was performed by using the nerve muscle model of a bull frog's sciatic nerve.
The purpose of this study is to find out the distributions of induced eddy current generated in the cranial model filled with the saline solution, when the model was exposed to pulsed magnetic fields. We discussed the relationship between a focality of the induced eddy currents and an excited location in the head due to the orientation of the coil. As a result, the distribution of induced eddy current depends on the structure of boundary of the skull or narrow space. This experiment showed that the highest density of induced eddy currents provided a result when the current flowed in the vicinity of the rear edge of foramen occipitale magnum. The intensity of induced eddy currents at the foramen magnum differs a little due to the direction of current flow. From the results of the nerve muscle model in the internal acoustic meatus by the magnetic stimulation, it is showed that the nerve is easy to be stimulated at where the change of induced eddy current density is very large or the nerve is bent in the finite medium, for example an arm tank model.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 湯ノ口 万友: "磁気刺激による神経興奮と刺激点の検討" 日本生体磁気学会誌. Vol.8・No.2. 1-6 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 湯ノ口 万友: "任意導体モデルを用いた磁気刺激による渦電流分布と神経興奮部位の検討" 電気学会論文誌C. Vol.116-C・No.2. 145-150 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Yunokuchi: "Characteristics of nerve excitation by the pulsed magnetic stimulation" Proceedings of International Conference of BME. BEM-96. 303-306 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Yunokuchi et al.: "Investigation of te Nerve Excitation and Stimulus Point using the Magnetic Stimulator" J.Japan Biomagnetism and Bioelectrmagnetics. Vol. 8, No. 2. 1-6 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Yunokuchi et al.: "Investigation of the Distribution of Eddy Current and the Nerve Excitation in the voluntary Volume Conductor using the mMagnetic Stimulator" Trans. IEEE of Japan. Vol. 116-C,No. 2. 145-150 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Yunokuchi et al.: "TCharacteristics of Nerve Excitation by the Pulsed Magnetic Stimulation" Proceedings of International Conference of BME. BME-96. 303-306 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 湯ノ口万友: "磁気刺激による神経興奮と刺激点の検討" 日本生体磁気学会誌. Vol.8・No.2. 1-6 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 湯ノ口万友: "任意導体モデルを用いた磁気刺激による渦電流分布と神経興奮部位の検討" 電気学会論文誌C. Vol.116-C・No.2. 145-150 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] K.Yunokuchi: "Characteristics of nerve excitation by the pulsed magnetic stimulation" Proceedings of International Conference on BME. BME-96. 303-306 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 湯ノ口万友: "磁気刺激による神経興奮と刺激点の検討" 生体磁気学会誌. (印刷中). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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