MR angiography (MRA). Radiological Society of North America Radiology Info website. Available at:
http://www.radiologyinfo.org/en/info.cfm?pg=angiomr. Updated July 2, 2012. Accessed May 20, 2013.
What is cardiac MRI? National Heart, Lung, and Blood Institute website. Available at:
http://www.nhlbi.nih.gov/health/health-topics/topics/mri. Updated February 2, 2012. Accessed May 20, 2013.
Yucel EK, Anderson CM, Edelman RR, et al. Magnetic resonance angiography:
update on applications for extracranial arteries.