PNS by the alternative magnetic field from the gradient coil is an important safety consideration in MRI scanning. Previous studies reported the chronaxie time of PNS in the arm by transcutaneous electrode stimulation (ES) might be very different from PNS by magnetic stimulation (MS). We simulated the electric field distributions and chronaxie of most sensitive nerve trajectories for both ES and MS cases in an anatomical real arm model and found the profile of the field distribution for both cases are very different but chronaxie values at the same order of magnitude.
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