Hi Matt Never heard of this type of scan had a MRI one done a few years ago it was a bit noisy sounded a bit like the old dial up internet connections before broadband came along. Guess the extra loudness of this scan you are having is because of the level of power being used? I found this out when a lump on my leg had to be investigated they originally was going to put me in a high power MRI machine but I had to tell them I had a stent fitted as they didn't seem to have my records on screen?? But they said they were glad that I told them and would put me in a lower power MRI machine but it would take a hr as against 30 mins in the higher MRI machine, but both machines would give the same results
time wise it all depends on the area's being acanned. Good luck with it and do let us know the results ATVB