Brief description of the study
After stroke, uninvolved brain regions reorganize the location of their areas of somatic control for the purpose of taking on brain functions lost as a result of cerebral infarction. Identifying imaging parameters corresponding to cerebral reorganization and demonstrating an association between neurological recoveries with ongoing cerebral reorganization will result in a better understanding of the stroke recovery process. This study will employ neuroimaging techniques [positron emission tomography (PET) and magnetic resonance (MR) imaging] to investigate cerebral reorganization after cerebral infarction. Longitudinal neuroimaging measures will be correlated with patient functional recovery.

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Brief description of the study
The purpose of this study is to contrast the relative efficacy of Carotid Artery Stenting versus Carotid Endarterectomy in 1) preventing stroke, myocardial infarction, and death during a 30-day periprocedural period, and 2) ipsilateral stroke to the study artery over the follow-up period in patients with symptomatic and asymptomatic extracranial carotid stenosis.

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