Yes, the band is MRI safe, I have had a few since being banded without any issues. The amount of metal with the band is very little so it doesn't interfere with the MRI machine.
I asked my surgeon's office about this..and yes, its ok. I was advised that as MRIs get more and more powerful there might come a day when it would need to be addressed. It sounds like the MRI place would have to be able to adjust down the settings.
The metal parts of the lapband is titanium and titanium isn't magnetic..........I have a titanium plate in my arm and have never had a problem and that is about 4 inches long.