MRI Machines Have Super-Strong Magnets
Standard MRI machines produce magnetic fields with strengths between 1.5 and 3 Tesla. One Tesla is equivalent to 10,000 gauss, and the Earth's magnetic field has a strength of about 0.5 gauss. Some specialized MRI machines utilize magnetic fields that are far stronger, from 7 to 9.4 Tesla, allowing for much greater image clarity. What's more, an MRI machine under development, called INUMAC, will have a magnetic field that tops out at 11.75 Tesla. That's enough strength to lift a tank!
from Physics Girl
Key Facts In This Video
MRI stands for magnetic resonance imaging. (1:04)
The base magnetic field of an MRI machine aligns all of the Hydrogen nuclei in your body. (2:09)
MRI machines don't use ionizing radiation, unlike x-rays and CT scans. (5:53)