Eligibility CriteriaAny subject suspected of having a stroke based on the NIH Stroke Scale and age 21 years or over.
Subjects will be enrolled into this protocol only if they are determined intellectually capable of providing their own informed consent.
No subjects will be included if they have a condition which would preclude their entry into the scanner (e.g., paralyzed hemidiaphragm, morbid obesity, claustrophobia, etc.) or present unnecessary risks (e.g., surgery of uncertain type, symptoms of pheochromocytoma or insulinoma, etc.).
No women who are pregnant or lactating.
No subjects with hemoglobinopathies and asthma.
No subjects with renal or hepatic disease.
No subjects who have a contraindication to MR scanning such as surgery that involves metal clips or wires which might be expected to concentrate radiofrequency fields or cause tissue damage from twisting in a magnetic field (e.g., aneurysm clip, implanted neural stimulator, implanted cardiac pacemaker or autodefibrillator, cochlear implant, ocular foreign body and mechanical pump).