Thinking about you - have the results yet?
The wait is killing me! I think it took about 4 days last time before I got the results.
The last time i looked into this, which was likely 5 years ago now, the 3T was said to show up to 25% more than the 1.5T but upgraded software and other things beyond me for the 1.5T's are suppose to of significantly improved what can be seen on the 1.5T....
The Mcdonald criteria was originally using the 1.5T MRI evidence so generally if there are lesions suggestive or consistent with MS, so whilst a 3T is better the 1.5T using MS protocol which is smaller slices of 3mm instead of the standard 5mm, should be enough to pick up MS brain lesions.
Information regarding copper iud's and MRI's:
"MRI at 3.0-T is possible for women with copper-containing IUDs. However, consulting a gynecologist to check the correct position of the IUD and exclude complications after an MR examination is highly recommended."
https://www.ncbi.nlm.nih.gov/pubmed/23690707
I tried to find something more updated for you, its probably available but i didn't have enough time to keep looking...
Hope that helps........JJ