新型磁気刺激コイルを用いた選択的運動領野による運動誘発電位

使用新型磁刺激线圈从选择性运动区域产生运动诱发电位

• 批准号: 06771087
• 负责人: 根本 仁
• 金额: $ 0.51万
• 依托单位: Fukushima Medical University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Encouragement of Young Scientists (A)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06771087/
• 关键词: 磁気刺激; 磁束密度; コイル; 運動誘発電位

最初に直径10cmの円形大コイル、直径5cmの円形小コイル、直径5cmの円形コイルを2つ組み合わせた8の字のコイルを作製し、磁束密度を測定して刺激となる渦電流の分布を検討した。磁束密度は、コイル辺縁が最大で中心部が最小であり、また磁束密度はコイルから離れるにつれてコイルの半径の2乗に反比例して減衰するため小さいコイルは深部の刺激には適さないことが明らかとなった。また、8の字コイルの接合部の磁束密度は、円形のコイルの辺縁の約1.4倍であった。この3種類のコイルを用いてネコの頭部を刺激して胸椎硬膜外から誘発電位の測定を試み、運動領野の選択的刺激が可能か否かを検討した。大コイルでは、脳全体が刺激されるため刺激閾値の低い錐体外路の誘発電位(伝導速度100m/s)のみが得られた。小コイルの辺縁および8の字コイルの接合部を運動領野に接するようにして刺激した場合には、錐体外路の他に伝導速度50m/sの多発性の誘発電位が得られた。この電位は、錐体路を含む脊髄背側を切断することにより消失し、運動誘発電位が含まれているものと考えられた。コイルの改良などの工夫により磁束密度の集束化が可能と考えられた。

The distribution of eddy current was investigated by measuring the magnetic beam density of a circular large tube with a diameter of 10 cm, a circular small tube with a diameter of 5 cm, and a circular tube with a diameter of 5 cm. The magnetic beam density is the largest in the center and the smallest in the center. The magnetic beam density is the largest in the center and the smallest in the center. The magnetic beam density is the largest in the center and the largest in the center. The magnetic beam density is the largest in the center and the largest in the center. The magnetic beam density is the largest in the center and the magnetic beam density is the smallest in the center. The magnetic beam density is the largest in the center and the magnetic beam density is the largest in the center. The magnetic beam density is the largest in the center and the magnetic beam density is the smallest in the center. The magnetic beam density is the largest in the center and the magnetic beam density is the largest in the center. The magnetic beam density is the largest in the center and the magnetic beam density is the largest in the center. The magnetic beam density is the largest in the center and the magnetic beam density is the smallest in the center. The magnetic beam density is the largest in the center and the center. The magnetic beam density is the largest in the center and the center. The magnetic beam density is the largest in the center. The magnetic beam density is the center. The magnetic beam The magnetic beam density of the joint part of the letter is about 1.4 times that of the letter. These three types of stimuli are used to determine the head stimulation of the thoracic epidural space, and to determine whether the stimulation of the motor field is possible. The induced potential of the extrapyramidal pathway (conduction velocity 100 m/s) was obtained at the low stimulation threshold and the high stimulation threshold. In the case of stimulation, the multi-inductive potential with a conduction speed of 50 m/s was obtained at the junction of the small cone and the 8-channel. The electric potential of the cone is contained in the back of the ridge, and the electric potential of the cone is contained in the back of the ridge. The improvement of magnetic beam density is possible.