• Generate a dynamic mapping of the distribution of iodine within the cerebral parenchyma in the patient suspected of acute ischemic disorder with the CT spectral scanner.
• Correlate the anomalies of iodine mapping to the other parameters acquired during the classic dynamic infusion phase to define the ischemic area (MTT higher and rCBV normal) versus infarcted zone (MTT higher and rCBV decreased)

Inclusion Criteria:

• Clinical suspicion of hyperacute stroke (6 hours after onset of symptoms)
• Age between 50 and 95 years
• Weight: between 65 and 95 kg

Exclusion Criteria:

• Documented or suspected allergy to IV iodinated contrast media
• Renal impairment with creatinine clearance <60 ml / min
• Hemorrhagic lesions or vascular abnormalities demonstrated on CT before contrast injection