Susceptibility Weighted Imaging (SWI) - Canadian Magnetic Imaging 

www.canmgnetic.com - Susceptibility Weighted Imaging or SWI is good for identifying old injuries to the brain, for example from a car accident. SWI helps identify hemosiderin, which is the final break down product of blood. SWI is best done several weeks or month after an injury because it takes time for blood to break down into hemosiderin.