Magnetic fields associated with gradient switching in magnetic resonance imaging (MRI) systems produce electric fields. In the case of fast switching fields of high magnitude, peripheral nerves stimulation (PNS) may occur [1], [2]. Several research groups have conducted investigations of PNS in human subjects, e.g. [1]-[9]. The stimulation threshold expressed as a function of the time derivative of the magnetic flux density, dB/dt, depends on the duration of the rectangular stimulus (pulse width) At, and can be described as [10].