The purpose of this study is to detect acute ischemic lesions in patients admitted with symptoms of transient ischemic attack (TIA).~Diffusion weighted Imaging (DWI) is today one of the best ways to detect ischemic lesions after TIA. The problem is that this only gives the diagnosis in 30% of the cases.~It is possible that the addition of ASL-perfusion imaging and diffusion tensor imaging will make it possible to give a more accurate and selective diagnosis of TIA.~Patients admitted with clinical signs of TIA can be included. Patients will be examined with the TIA protocol in reference to the standardized clinical care:~1,5 tesla gradient echo and 3 tesla Susceptibility weighted imaging (SWI) to detect microbleed as sign of small vessel disease.~Axial T2 FLAIR to detect white matter lesions.~Axial DWI to detect areas with impeded diffusion.~(Total scantime 10min)~If no signs of ischemic lesions is detected the following additional research scan-protocol will be initiated:~Perfusion without contrast: Arterial spin labeling (ASL) with the ability of showing signs of ischemia.~Diffusion tensor imaging (DTI): Has a higher sensitivity than DWI in displaying local ischemic lesions.~(Total additional scantime 10min)~All in All 20min in the scanner.
The purpose of this study is to detect acute ischemic lesions in patients admitted with symptoms of transient ischemic attack (TIA).~Diffusion weighted Imaging (DWI) is today one of the best ways to detect ischemic lesions after TIA. The problem is that this only gives the diagnosis in 30% of the cases.~It is possible that the addition of Arterial spin labeling (ASL) perfusion imaging and diffusion tensor imaging will make it possible to give a more accurate diagnosis.