In which I describe the components of an MRI scanner...
So following on from last week – other than a lot of money to pay for it all*, what do you need for an operational MRI scanner?
*Scanners are often upward of several million pounds.
A Large Magnet
In order to make a significant number of the spins in your body align in one direction a very powerful magnet is needed. The strength of these magnets is measured by a large unit called the Tesla (symbol: T). To get an appreciation of how strong that is there is another unit called the gauss which is also used to measure magnetic fields. 1 Tesla = 10,000 gauss and a normal bar magnet is around 100 gauss.