Cylindrical tissue model for magnetic field stimulation of neurons: effects of coil geometry

An analytical solution for the electric field induced in a homogeneous cylindrical conductor under quasi-static conditions from current in a coil is used to model peripheral nerve stimulation with magnetic fields. A variety of coil geometries is analyzed in terms of the spatial derivative of the induced electric field along a long straight nerve, parallel to the axis, in a human-arm model. The results of these computations are found to be in general agreement with conclusions regarding the optimization of stimulating coils derived from analyses of the semi-infinite tissue model. The differences and their physical basis are pointed out.<<ETX>>

[1]  Mark Hallett,et al.  A theoretical calculation of the electric field induced by magnetic stimulation of a peripheral nerve , 1990, Muscle & nerve.

[2]  K. Harada,et al.  Localized stimulation of neural tissues in the brain by means of a paired configuration of time-varying magnetic fields , 1988 .

[3]  M Hallett,et al.  A theoretical calculation of the electric field induced in the cortex during magnetic stimulation. , 1991, Electroencephalography and clinical neurophysiology.

[4]  N M Branston,et al.  Analysis of the distribution of currents induced by a changing magnetic field in a volume conductor , 1991 .

[5]  M.A. Stuchly,et al.  Neural stimulation with magnetic fields: analysis of induced electric fields , 1992, IEEE Transactions on Biomedical Engineering.

[6]  P. Ravazzani,et al.  Magnetic stimulation of the motor cortex-theoretical considerations , 1991, IEEE Transactions on Biomedical Engineering.

[7]  M.A. Stuchly,et al.  Quasi-static electric field in a cylindrical volume conductor induced by external coils [human body application] , 1994, IEEE Transactions on Biomedical Engineering.

[8]  Shoogo Ueno,et al.  Estimation of structures of neural fibers in the human brain by vectorial magnetic stimulation , 1991 .

[9]  A. Barker,et al.  Motor responses to non-invasive brain stimulation in clinical practice , 1985 .

[10]  B N Cuffin,et al.  Developing a more focal magnetic stimulator. Part I: Some basic principles. , 1991, Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society.

[11]  Electric fields induced by low frequency magnetic fields in inhomogeneous biological structures that are surrounded by an electric insulator. , 1990, Bioelectromagnetics.

[12]  A. Barker,et al.  NON-INVASIVE MAGNETIC STIMULATION OF HUMAN MOTOR CORTEX , 1985, The Lancet.