Risks and Accidents in Magnetic Resonance Imaging
This lecture will focus on the risks and accidents associated with magnetic resonance imaging (MRI). Risk factors and safety issues related to human exposure in high static magnetic fields, time-varying magnetic fields and radiofrequency fields will be considered. Short-term biological effects, related exposure limits and frequent errors which could lead to accidents will be presented. The issue concerning the acoustic noise in the MRI environment will be reviewed, whilst hazards associated with patient implants and the use of medical devices in the scanner room will be examined. Emphasis will be put on the rotational and projectile effects of ferromagnetic objects. Oxygen concentration and ventilation issues within the MRI examination room will also be mentioned, as well as safety concerns in relation to the use of Gd-based contrast agents. Safety guidelines and good practices to reduce risks and accidents in MRI will be highlighted.