Serial brain MRI at 36 month intervals as a surrogate marker for Alzheimer's disease
K M Bradley, MRCP, FRCR1,
G M Bydder, FRCR2,
M M Budge, FRACP1,
J V Hajnal, PhD2,
S J White, DCR2,
B D Ripley, PhD3 and
A D Smith, DPhil1
1 Oxford Project to Investigate Memory and Ageing, University of Oxford, Radcliffe Infirmary, Woodstock Road, Oxford OX2 6HE, 2 Magnetic Resonance Unit, MRC Clinical Sciences Centre, Hammersmith Hospital, London and 3 Department of Statistics, University of Oxford, Oxford, UK

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Figure 1. National Institute of Neurological and Communicative Disorders and Stroke Alzheimer's disease negative subject. (a) Baseline image; (b) registered image 6 months later; (c) registered difference image.
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Figure 2. National Institute of Neurological and Communicative Disorders and Stroke Alzheimer's disease probable subject. (a) Baseline image; (b) registered imaged 6 months later; (c) registered difference image with black representing loss of tissue.
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Figure 3. Rate of change of ventricular brain volume. MRI scans were performed at 2.57 month intervals, as shown by open circles for each subject. ( ), calculated mean rate of change for each group: National Institute of Neurological and Communicative Disorders and Stroke (NINCDS) probable (Prob), possible (Poss) and negative (Neg) for Alzheimer's disease; (), two NINCDS Neg subjects referred with objective memory complaints.
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Figure 4. Influence of age on brain ventricular volume. V:B, cerebral ventricle:total brain volume ratio.
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Figure 5. Power calculation (90%) to detect a reduction in the rate of change of cerebral ventricle:total brain volume between treated and untreated groups of National Institute of Neurological and Communicative Disorders and Stroke (NINCDS) Alzheimer's disease (AD) probable subjects, compared with NINCDS AD negative subjects.
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Copyright © 2002 by the British Institute of Radiology.