VISUALIZATION OF A MOVING QUADRUPOLE WITH MAGNETIC MEASUREMENTS OF PERIPHERAL-NERVE ACTION FIELDS
VISUALIZATION OF A MOVING QUADRUPOLE WITH MAGNETIC MEASUREMENTS OF PERIPHERAL-NERVE ACTION FIELDS
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DOI：
10.1016/0168-5597(94)90154-6
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发表时间：
1994-12-01
期刊：
影响因子：
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通讯作者：
OKAZAKI, H
中科院分区：
文献类型：
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作者：
HASHIMOTO, I;MASHIKO, T;OKAZAKI, H
磁复合作用场（CAF）在右臂的63个传感器的位置与两个7通道SQUID梯度计系统测量后，在手腕正中神经的电刺激。CAF的场映射揭示了具有前导去极化和拖尾复极化前沿的传播四极模式。CAF在纵向上的平均分布对于去极化场为9.0 cm长，对于复极场为7.3 cm长，这与基于CAF的持续时间（3 msec）和神经传导速度的理论预测非常一致（50米/秒）;去极化前沿的最大值和复极化前沿的最小值之间的距离为6.3厘米。学习和拖尾偶极子位置的这种空间分离部分地表明在神经纤维的去极化段处或附近具有相反极性的场的相互抵消。
Magnetic compound action fields (CAFs) over the right arm were measured from 63 sensor positions with two 7-channel SQUID gradiometer systems following electrical stimulation of the median nerve at the wrist. The field mapping of the CAFs revealed a propagating quadrupolar pattern with the leading depolarization and trailing repolarization fronts. The average distribution of the CAFs in the longitudinal direction was 9.0 cm in length for the depolarization field and 7.3 cm for the repolarization field in good agreement with a theoretical prediction based on the duration (3 msec) of the CAFs and the conduction velocity of the nerve (50 m/sec); The distance between the maxima of the depolarization front and the minima of the repolarization front was 6.3 cm. This spatial separation of the learning and trailing dipole locations suggests in part mutual cancellation of the fields with opposite polarity at or near the depolarized segment of nerve fibers.