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The basic standard Magenetic Resonance Imaging (MRI) sequences which should be applied in screening for stroke are T1 and T2- weighted axial or sagittal scans through the whole brain. In hyperacute stroke MRA sequences provide valuable and accurate information in respect to the patency of the major intracranial vessels. The principal use for Magnetization Transfer Contrast (MTC) in the stroke context is in time of flight (TOF) MRA, where it suppresses background parenchymal signal, increasing the conspicuity of small vessels. Fluid Attenuated Inversion Recovery (FLAIR) is a routinely available technique which produces heavily T2-weighted images, at the same time nulling or completely subtracting the normally bright cerebrospinal fluid signal. Hyperacute parenchymal hemorrhage can be detected by MRI by utilizing one of the T2-weighted magnetic susceptibility sensitive sequences such as T2-weighted gradient echo (GE). Standard MRI sequences are extremely sensitive to the detection of acute, subacute and chronic infarcts.
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