Magnetic resonance imaging (MRI) can be used to create detailed cross-sectional images of the human body, enabling precise assessment of organs and pathological changes. MRI is based on a very strong static magnetic field (typically 1.5 to 3 Tesla), spatially varying magnetic field gradients, which are used to localize the image, as well as high-frequency alternating electromagnetic fields in the radio frequency range, which excite the hydrogen nuclei in the body to resonate.
MRI is a safe imaging procedure that works without ionizing radiation. Nevertheless, there have been accidents in the past caused by the strong static magnetic field. These incidents occurred when ferromagnetic materials such as metallic objects or certain implants entered the magnetic field and were moved uncontrollably by the strong attractive force.
An important aspect of MRI safety is that the magnet cannot simply be switched off, as it is based on superconducting technology and is continuously cooled. A so-called "quench", in which the magnetic field is abruptly switched off, is possible, but involves risks and is only intended for emergencies.
Find out more about the basics of MRI safety and why certain precautionary measures are essential. Through small experiments, you can feel the enormous power of the static magnetic field for yourself and experience first-hand why strict safety precautions are so important in MRI.
Medical advice:
Please note that there is a strong, permanent magnetic field that cannot be switched off. For safety reasons, people with implants or metallic foreign bodies are strongly advised not to enter the magnetic room.