Even devices that use alternating magnetic fields in the radiofrequency range, such as magnetic resonance imaging (MRI), do not use ionizing radiation. MRI was developed as an imaging technique in 1973 by Paul Christian Lauterbur (1929-2007) with significant contributions from Sir Peter Mansfield (1933-2017). Jewelry or piercings can become very hot; on the other hand, a high tensile force is exerted on the jewelry, which in the worst case can cause it to be torn out. To avoid pain and injury, jewelry containing ferromagnetic metals should be removed beforehand. Pacemakers, defibrillator systems, and large tattoos in the examination area that contain metallic color pigments may heat up or cause second-degree burns or malfunction of the implants.