Evaluation of PET Scan Timing Relative to AV-45 Injection Time
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Percent Agreement of Interpretation Between 30-40 and 50-60 Min Reads - Qualitative Evaluation [ Time Frame: Scans acquired 30-40 min and 50-60 min after injection ]
Three independent readers blinded to subject identification, subject diagnosis, subject demographics and PET scan time points post-injection read each scan and reported as amyloid positive or amyloid negative. Results show the percentage of agreement between the majority read of 30-40 min scan and the majority read of the 50-60 min scan.
Secondary Outcome Measures :
Agreement of Interpretation Between 30-40 and 50-60 Min Reads - Semi-quantitative Evaluation [ Time Frame: Scans acquired 30-40 min and 50-60 min post-injection ]
Three independent readers blinded to subject identification, subject diagnosis, subject demographics and PET scan time points post-injection read each scan and reported the results using a 5-point scale (0=no amyloid; 4=high levels of amyloid deposition). Results are reported as a weighted kappa statistic.
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Ages Eligible for Study:
35 Years and older (Adult, Older Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
Eligibility for subjects scans to be used in this study is determined by subject's eligibility/enrollment in Study A01(NCT01565291) or A03(NCT01565330).
Inclusion Criteria (AD group):
Greater than 50 years of age
Probable AD according to the National Institute of Neurological and Communication Disorders and Stroke-Alzheimer's Disease and Related Disorders Association (NINCDS-ADRDA) criteria
Mild/moderate dementia as evidenced by a Mini-Mental State Examination (MMSE) score ranging from 10 to 24, boundaries included, at screening
History of cognitive decline gradual in onset and progressive over a period of at least 6 months
Neurodegenerative disorders other than AD, including, but not limited to Parkinson's disease, Pick's disease, fronto-temporal dementia, Huntington's chorea, Down syndrome, Creutzfeldt-Jacob disease, normal pressure hydrocephalus, and progressive supranuclear palsy
Diagnosis of other dementing / neurodegenerative disease
Diagnosis of mixed dementia
Cognitive impairment resulting from trauma, hypoxic damage, vitamin deficiency, brain infection, brain cancer, endocrine disease, or mental retardation
Clinically significant infarct or possible multi-infarct dementia as defined by the NINCDS criteria
Evidence on screening MRI or other biomarker that suggests alternate etiology for cognitive deficit (for healthy controls, evidence suggesting the presence of AD pathology)
Clinically significant psychiatric disease
History of epilepsy or convulsions
Clinically significant hepatic, renal, pulmonary, metabolic, or endocrine disturbances
Current clinically significant cardiovascular disease
Received investigational medication within the last 30 days