People get in touch with strong static magnetic fields for example during magnetic resonance imaging, a diagnostic method used in medicine. The devices used actually in clinical practice have predominantly a magnetic flux density of 1.5 or 3 Tesla. In research, devices with 7 and 9.4 Tesla are already tested. In the future, these devices will be introduced in medical diagnostic. The question, if these stronger fields affect the health of patients and medical stuff, has been investigated in three research projects commissioned by the BfS.