CT Perfusion - CTP
Perfusion Imaging is an Advanced Stroke Imaging Modality, that is used as an additional tool for assessment of ischemic pneumbra, ie. tissue at risk. It is also useful in detection of distal occlusions.
Matched Perfusion Deficit, ie. all areas of increased contrast transit time correspond to low CBV values and hence represent infarcted tissue. There is no brain to save here.