Although I must say, using MRI, even such a powerful one, for research is not as useful or cool as you'd expect since it takes so long to do one scan.

We are just beginning to investigative the post operative changes from anaesthesia in adults [1]. Can we be sure that there is no post MRI changes ?

While I'm not suggesting there is any cause for alarm I don't think we should dismiss the possibility out of hand.

[1] http://www.scientificamerican.com/article/hidden-dangers-of-...