Assessment and Quantification of Collateral by ASL MRI

Recruiting

Phase N/A Results N/A

Eligibility Criteria

Inclusion Criteria

- Ischemic stroke or TIA in anterior circulation within 90 days
- MCA atherosclerotic moderate to severe stenosis(50%-99%) confirmed by conventional angiography or magnetic resonance angiography
- Age >18
- 2 or more atherosclerotic risk factors including hypertension, hypercholesterolemia, diabetes mellitus, cigarette smoking, and obesity
- Medical treatment
- Not receiving stent therapy
- Ability to comply with all studies

Exclusion Criteria

- Multiple intracranial arteries stenosis (> 50%) or occlusion
- Less than 2 atherosclerotic risk factors
- Pregnancy and other contraindication to MRI scan
- Informed consent not obtained