1. The document discusses safety issues related to magnetic resonance (MR) environments, focusing on the three main electromagnetic fields: static magnetic fields, gradient fields, and radiofrequency fields. 2. It defines potential biological effects and mechanical risks of static magnetic fields, including effects on ECG readings and risks of attractive forces on metallic objects. 3. It also outlines safety considerations and risks related to gradient fields inducing currents, radiofrequency fields causing tissue heating and potential burns, and ensuring proper patient preparation and safety protocols are followed.