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Relating one-year cognitive change in mild cognitive impairment to baseline MRI features.

Publication Type:

Journal Article

Source:

Neuroimage, Volume 47, Issue 4, p.1363-70 (2009)

Keywords:

Aged, Algorithms, Alzheimer Disease, Brain, Cognition Disorders, Female, Humans, Image Enhancement, Image Interpretation, Computer-Assisted, Magnetic Resonance Imaging, Male, Reference Values, Reproducibility of Results, Sensitivity and Specificity

Abstract:

<p><b>BACKGROUND: </b>We propose a completely automated methodology to investigate the relationship between magnetic resonance image (MRI) features and changes in cognitive estimates, applied to the study of Mini-Mental State Examination (MMSE) changes in mild cognitive impairment (MCI).</p><p><b>SUBJECTS: </b>A reference group composed of 75 patients with clinically probable Alzheimer's Disease (AD) and 75 age-matched controls; and a study group composed of 49 MCI, 20 having progressed to clinically probable AD and 29 having remained stable after a 48 month follow-up.</p><p><b>METHODS: </b>We created a pathology-specific reference space using principal component analysis of MRI-based features (intensity, local volume changes) within the medial temporal lobe of T1-weighted baseline images for the reference group. We projected similar data from the study group and identified a restricted set of image features highly correlated with one-year change in MMSE, using a bootstrap sampling estimation. We used robust linear regression models to predict one-year MMSE changes from baseline MRI, baseline MMSE, age, gender, and years of education.</p><p><b>RESULTS: </b>All experiments were performed using a leave-one-out paradigm. We found multiple image-based features highly correlated with one-year MMSE changes (/r/>0.425). The model for all N=49 MCI subjects had a correlation of r=0.31 between actual and predicted one-year MMSE change values. A second model only for MCI subjects with MMSE loss larger than 1 U had a pairwise correlation r=0.80 with an adjusted coefficient of determination r(2)=0.61.</p><p><b>FINDINGS: </b>Our automated MRI-based technique revealed a strong relationship between baseline MRI features and one-year cognitive changes in a sub-group of MCI subjects. This technique should be generalized to other aspects of cognitive evaluation and to a wider scope of dementias.</p>

Funding / Support / Partners

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