CT Perfusion has emerged as a useful tool to guide decision making in acute stroke treatment. CT perfusion parameters can be a marker of cerebrovascular reserve and show changes in atherosclerotic cerebrovascular disease, including carotid stenosis. Changes to cerebral perfusion can be seen post-revascularization, with dMTT and rCBF commonly showing significant improvement. Future applications may include diagnosing and predicting risk of complications post revascularisation.