Magnetic resonance imaging (MRI) is increasingly being used in the diagnosis and management of acute ischemic stroke and is sensitive and relatively specific in detecting changes that occur after such strokes. Advances in MRI include higher strength of magnetic field (1.5-3.0 T field strength) yielding better resolution of images, newer sequences of images, and the advent of the open MRI for patients who are claustrophobic or overweight. Recently, 7.0 and 9.4 T field strength MRI have been introduced with higher signal-to-noise (SNR) and contrast-to-noise (CNR) ratios compared to lower field strengths. However, limitations such as inhomogeneous transmit fields and extensive contraindications for patient scanning restricts their clinical application in acute stroke.
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