A novel method is described for simulation of an electric stimulation of
the nerve system subject to the rate of change of gradient fields. A
gradient signal is filtered and a stimulation signal is derived, which is
compared with a predetermined stimulation threshold value. An indicator
signal is generated if the threshold value is exceeded. Therefore the
time dependent and spatially dependent electric fields as defined by the
scanning sequence and the gradient coil properties are calculated. A
vector combination of said calculated electric field components from each
gradient coil axis is performed, which results in a temporal diagram of
the total electric field at various spatial locations within the gradient
coil. The stimulation probability at each location from said temporal
diagram and said stimulation signal is then calculated, and said
stimulation probability is compared with the stimulation threshold value
at each location within the gradient coil.