Question 16 from the second paper of 2008 discussed the risks associated with MRI scanning for ICU patients. The college graciously omitted transport logistics from their question ("you do not have to outline risks associated with transport to and from the scanner") these are still important considerations. , They are important because according to one risk/cost/benefit analysis, "transportation of patients from the ICU resulted in a large number of physiologic changes, each requiring changes in support". Of these physiologic changes, 68% were described as "serious" (eg. requiring more vasopressors or a higher FiO2).
Now, to MRI issues. This article contains a chapter ("MRI Transport") which covers this topic in brief. A substantial detailed exploration can be found in David Olive's article for Australasian Anaesthesia(2005)
Risks from the magnet
Risks from contrast
Risks from the isolated room
Risks from being critically ill
INDECK, MATTHEW, et al. "Risk, cost, and benefit of transporting ICU patients for special studies." Journal of Trauma-Injury, Infection, and Critical Care 28.7 (1988): 1020-1025.
Tobin, J. R., E. A. Spurrier, and R. C. Wetzel. "Anaesthesia for critically ill children during magnetic resonance imaging." British journal of anaesthesia69.5 (1992): 482-486.
Blakeman, Thomas C., and Richard D. Branson. "Inter-and Intra-hospital Transport of the Critically Ill." Respiratory care 58.6 (2013): 1008-1023.
ANZCA have an excellent college publication on this exact topic:
D.Olive, "Don't Get Sucked in: Anaesthesia for Magnetic Resonance Imaging" - Australasian Anaesthesia 2005, pp.85