1. A magnetic resonance system comprising: an image acquisition unit adapted to interact with an examination subject to acquire a magnetic resonance image of the examination subject; an image processing unit supplied with said magnetic resonance image that automatically searches said image for geometric figures exhibited by the examination subject that could result in closed current loops in the examination subject; an information unit connected to said image processing unit that generates a humanly perceptible indication if and when a geometric figure that could lead to a closed current loop is detected in the magnetic resonance image by the image processing unit.