MRI

The magnet used to create the constant external magnetic field is the largest piece of any MRI system. To be useful,  the magnet must be able to produce a stable magnetic field that penetrates throughout a certain volume, or slice, of the body. It is available in three different types of magnet. A resistive magnet is made up of thin aluminum bands wrapped in a loop.  When the current is surrounded by a magnetic field that is perpendicular to the loops in the loop created. In MRI systems, four mutually perpendicular resistive magnet is arranged to generate a uniform magnetic field. As electricity is conducted around the loop, the resistance of the loop generates heat, which must be dissipated by a cooling system.