Universität zu Köln

Conwell, K., von Reutern, B., Richter, N., Kukolja, J., Fink, G. R. and Onur, O. A. (2018). Test-retest variability of resting-state networks in healthy aging and prodromal Alzheimer's disease. NeuroImage-Clin., 19. S. 948 - 963. OXFORD: ELSEVIER SCI LTD. ISSN 2213-1582

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Abstract

In recent years, changes in resting-state networks (RSN), identified by functional magnetic resonance imaging (fMRI), have gained increasing attention as potential biomarkers and trackers of neurological disorders such as Alzheimer's disease (AD). Intersession reliability of RSN is fundamental to this approach. In this study, we investigated the test-retest reliability of three memory related RSN (i.e., the default mode, salience, and executive control network) in 15 young, 15 healthy seniors (HS), and 15 subjects affected by mild cognitive impairment (MCI) with positive biomarkers suggestive of incipient AD (6 females each). FMRI was conducted on three separate occasions. Independent Component Analysis decomposed the resting-state data into RSNs. Comparisons of variation in functional connectivity between groups were made applying different thresholds in an explorative approach. Intersession test-retest reliability was evaluated by intraclass correlation coefficient (ICC) comparisons. To assess the effect of gray matter volume loss, motion, cerebrospinal fluid based biomarkers and the time gap between sessions on intersession variation, the former four were correlated separately with the latter. Data showed that i) young subjects ICCs (relative to HS/MCI-subjects) had higher intersession reliability, ii) stringent statistical thresholds need to be applied to prevent false-positives, iii) both HS and MCI-subjects (relative to young) showed significantly more clusters of intersession variation in all three RSN, iv) while intersession variation was highly correlated with head motion, it was also correlated with biomarkers (especially phospho-tau), the time gap between sessions and local GMV. Results indicate that time gaps between sessions should be kept constant and that head motion must be taken into account when using RSN to assess aging and neurodegeneration. In patients with prodromal AD, re-test reliability may be increased by accouting for overall disease burden by including biomarkers of neuronal injury (especially phospho-tau) in statistical analyses. Local atrophy however, does not seem to play a major role in regards to reliability, but should be used as covariate depending on the research question.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Conwell, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED von Reutern, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Richter, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kukolja, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fink, G. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Onur, O. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-200857
DOI:	10.1016/j.nicl.2018.06.016
Journal or Publication Title:	NeuroImage-Clin.
Volume:	19
Page Range:	S. 948 - 963
Date:	2018
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	2213-1582
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MILD COGNITIVE IMPAIRMENT; DEFAULT-MODE NETWORK; INTRINSIC CONNECTIVITY NETWORKS; FUNCTIONAL CONNECTIVITY; HUMAN BRAIN; FMRI; RELIABILITY; MRI; SCALE; REPRODUCIBILITY Multiple languages Neuroimaging Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/20085