1. A method, wherein the perfusion parameter map is a CBV parameter map, and further including: determining a plausibility of one or more perfusion parameter maps generated based on perfusion image data; correcting at least one of the perfusion parameter maps when the plausibility for the at least one perfusion parameter map does not satisfy pre-set perfusion parameter plausibility criteria; obtaining temporal MIP (tMIP) image data; creating a vessel mask based on a default pre-set mask threshold; generating masked tMIP image data based on the tMIP image data and the mask; determining a feature value of the masked image; comparing the feature value with a pre-set CBV threshold; and validating the CBV parameter map only when the feature value is less than the pre-set CBV threshold.