ABSTRACT
Magnetic resonance (MR) perfusion weighted imaging (PWI) is a functional MR imaging technique that reflects the distribution of tissue microvessels and blood perfusion. In recent years,with the development of MR technology, PWI has been widely used in the clinical diagnosis and treatment of cerebral infarction. Dynamic susceptibility contrast-enhanced imaging can delineate the ischemic penumbra and evaluate the compensation of collateral circulation. Dynamic contrast-enhanced imaging can reflect the integrity of blood-brain barrier, evaluate risk of the hemorrhagic transformation and the compensation of collateral circulation. The technique of arterial spin labeling can also be used to delineate ischemic penumbra, confirm the perfusion around the infarct core,and to evaluate the collateral circulation. The relevant studise on MR PWI in acute cerebral infarction will be reviewed.