Journal
NEUROIMAGE
Volume 200, Issue -, Pages 528-539Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2019.06.017
Keywords
Brain aging; Brain imaging; UK biobank
Funding
- Wellcome Trust [098369/Z/12/Z, 203139/Z/16/Z]
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It is of increasing interest to study brain age - the apparent age of a subject, as inferred from brain imaging data. The difference between brain age and actual age (the delta) is typically computed, reflecting deviation from the population norm. This therefore may reflect accelerated aging (positive delta) or resilience (negative delta) and has been found to be a useful correlate with factors such as disease and cognitive decline. However, although there has been a range of methods proposed for estimating brain age, there has been little study of the optimal ways of computing the delta. In this technical note we describe problems with the most common current approach, and present potential improvements. We evaluate different estimation methods on simulated and real data. We also find the strongest correlations of corrected brain age delta with 5,792 non-imaging variables (non-brain physical measures, life-factor measures, cognitive test scores, etc.), and also with 2,641 multimodal brain imaging-derived phenotypes, with data from 19,000 participants in UK Biobank.
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