Notes
MRI machines produce very strong magnetic fields.
Wikipedia has a chart showing the strength of a variety of magnetic fields. The electromagnet in an MRI machine is at least 100 times stronger than a fridge magnet.
National MagLab – See-Thru Science: How MRI Machines Work (4:43)
What’s the Difference Between an MRI and a CT? (2:31)
My First MRI (2:58)
Because the magnetic field in an MRI is so strong, it is very dangerous to have ferromagnetic materials in the MRI room.
Zaheer Abbas – Dangers of MRI (2:02)
How Dangerous Are Magnetic Items Near an MRI Magnet (2:48)