Shall I spoil the fun and tell you how they work??? LOL!
(Actually, if anyone is interested, I’m happy to.)
Mandy: 3T is generally much better than 1.5T for the brain, but there is some argument about the spine and it depends on what scans are being done how much better it is (it’s not twice as good - sometimes it’s more, sometimes it’s less).
Put it this way… when I had an NHS 1.5T scan done a couple of years ago, I was horrified at how poor it was so I got a 3T scan done at Uni the following day. I compared them by adding up how many lesions each scan showed just in the cerebrum (so excluding the brain stem and cerebellum). The NHS scans (3 of them, the best of which had 5mm slices) showed 9 lesions in total. The Uni scans (2 of them, both 3mm slices) showed 25.
Incidentally, I only spotted some of the NHS lesions because I went back and looked again after seeing them on the Uni scans.
Part of this difference was due to the scanner strength (there is plenty of evidence that 3T scanners show up more lesions than 1.5T scanners), but the other difference was the slice thickness: the thinner the slices, the better because small lesions vanish on images acquired with large slices.