Table 1.

Comparison between MR and CT perfusion

CT	MRI
Detection of hemorrhage	Detection of hemorrhage with SWI
Angiography, better resolution	Angiography, non-contrast
Faster, more available, less restrictive	Slower, limited availability, restrictive environ
Radiation	No radiation
Limited in posterior fossa	Better detection in posterior fossa
Limited detection of small lesions	Better detection of small lesions (DWI)
Less specific in detection of “stroke mimics”	Better detection of “stroke mimics,” especially on contrast-enhanced scans

SWI susceptibility-weighted imaging, DWI diffusion-weighted imaging