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!