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.