- Contraindication to MRI: a)Intracranial aneurysm clips (Unless the investigator is certain that it is made of non-ferromagnetic material such as titanium)b)Intra-orbital metal fragments c)Any electrically, magnetically or mechanically activated implants (including cardiac pacemakers, biostimulators, neurostimulators, cochlear implants, and hearing aids) d)Warning about Gadolinium-based contrast agents (GBCAs) Exposure to GBCAs increases the risk for nephrogenic systemic fibrosis (NSF). Therefore the following subjects should be excluded from the trial based on a history and/or laboratory tests: