Subjects who pass all four steps will be considered
‘tentatively enrolled’ if they are willing to undergo MRI with MRI safety verification in step 3 above, or ‘enrolled’ if they refuse to participate in MRI or without MRI safety clearance in step 3 above. Tentatively enrolled subjects will be further screened for MRI eligibility using the Volunteer Safety Screening questionnaire mandated by the Center for Magnetic Resonance Imaging, and undergo baseline MRI if deemed safe. Subjects whose scans meet the following criteria will be notified to pursue medical evaluation with their providers and excluded from the study: normal pressure hydrocephalus, brain tumor, subdural hematoma, significant post traumatic ence- phalomalacia, one or more large hemispheric infarctions. Subjects whose scans do not meet those MRI exclusion criteria will be formally enrolled in the study.
The subject timeline is depicted in Figure 2. The actual date of enrollment of the first subject was 3 June 2014.