Evaluation of rSO2 Between Frontal Lesion Area and Normal Area of Brain by NIRSITX Using NIRS in Acute Ischemic Stroke Patients.

Inclusion Criteria: * Adults over age 19 * Patients diagnosed with acute ischemic stroke within 7 days of symptom onset * Patient's condition confirmed to have an acute ischemic stroke and also brain blood vessels condition confirmed through brain imaging such as Brain CT/CTA/CT perfusion and Brain MRI/MRA * Patients voluntarily agree to participate and scheduled to participate in this clinical trial * Patients willing to comply with the clinical trial protocol Exclusion Criteria: * Patients without brain imaging result * Patients diagnosed with jaundice (hyperbilirubinemia) with abnormal skin color - Patients who find it difficult to wear medical devices for clinical trial on their foreheads * Patients who has skull fractures of external shape not maintained normal * Patients who does not agree to participate in this clinical trial * Patients who are currently participating in another clinical trial or have participated in another clinical trial within 30 days of the screening date * Patients who is determined from investigator that participating is inappropriate because it may affect the results of the clinical trial or ethically