Magnetic stimulation artifacts

How to eliminate artifacts caused by magnetic stimulation (do not confuse with MRI artifacts):
  • The magnetic stimulator could induce a current to flow in the (for example) EMG leads.  A possible solution might be to twist the EMG recording leads in a tight spiral so the effects of the external magnetic field are minimized.
  • Another method would be to shield the leads using a highly magnetically conductive material (like permalloy).  This material requires no electrical connection.  A permalloy cable wrapped around the leads could help reduce artifact. Normal shielded leads would not help in this situation if a magnetic field looks to be the primary culprit. The shielded leads only work to minimize impacts of electric fields, not magnetic fields.
  • Finally, it may be possible to reduce or remove the noise in post-processing or real-time.

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