High-resolution vessel wall imaging(HR-VWI) is an novel technique used to assess intracranial artery stenosis, and it has been useful in clinical practice. In addition, time-to-maximum (Tmax) maps, derived from PWI, are increasingly being used in studies of ischemic stroke, such as EPITHET and DEFUSE-2 . Our study aimed to investigate how the degree of stenosis of the MCA or ICA affects brain tissue perfusion. The results showed that the degree of MCA or ICA stenosis was positively correlated with the Tmax delay volume, and different degrees of ICA or MCA stenosis presented with different perfusion delay volumes.
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