| 講演名 | 2011-05-26 Electric Field Induced in Retina and Brain at Threshold Magnetic Flux Density Causing Magnetophosphenes , |
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| 抄録(英) | In the international safety guidelines/standards, the rationale for human protection from extremely-low-frequency magnetic field exposure is to prevent the magneto-stimulation. The threshold in-situ electric field for magnetophosphenes has been experimentally derived as 8.14 mT at 20 Hz. However, the corresponding in-situ electric field in the central nervous system has not been well investigated. The present study derived computationally in-situ electric field in the brain and retina in different anatomically-based numeric human models exposed to uniform magnetic fields at extremely low frequencies. A quasi-static finite-difference time-domain method was applied to analyze this problem. First, the computational uncertainty caused by using a stair-casing model is investigated by comparing the electric field induced in a three-layer sphere obtained by the computational method to an analytical solution. In addition, the electric fields induced in anatomically-based models with different resolutions are also compared. For our computational results, the 99^ | percentile value of the in-situ electric field is found to be reasonable both for the sphere and anatomically-based models with different resolutions. Then, the 99^ | percentile values of the electric field in the brain and retina in different models are computed for exposure at the threshold magnetic flux density for magnetophosphenes. When comparing the 99^ | percentile value in the brain of the anatomically-based model with those derived from an ellipsoid defined in the IEEE standard, the former was 10-70% larger than the latter. The main reason for this difference is attributed to the remaining part of the body in addition to the model inhomogeneity. |
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| キーワード(英) | computational dosimetry / in-situ electric field / magnetophosphenes | |||
| 資料番号 | EMCJ2011-19,MW2011-16,EST2011-12 | |||
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| 研究会 | EST |
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| 開催期間 | 2011/5/19(から1日開催) |
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| 申込み研究会 | Electronic Simulation Technology (EST) |
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| 本文の言語 | ENG |
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| タイトル（英） | Electric Field Induced in Retina and Brain at Threshold Magnetic Flux Density Causing Magnetophosphenes |
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| キーワード(1)（和/英） | / computational dosimetry |
| 第 1 著者 氏名（和/英） | / Akimasa Hirata |
| 第 1 著者 所属（和/英） | Graduate School of Engineering, Nagoya Institute of Technology |
| 発表年月日 | 2011-05-26 |
| 資料番号 | EMCJ2011-19,MW2011-16,EST2011-12 |
| 巻番号（vol） | vol.111 |
| 号番号（no） | 66 |
| ページ範囲 | pp.- |
| ページ数 | 6 |
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