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Longitudinal reproducibility of default-mode network connectivity in healthy elderly participants: A multicentric resting-state fMRI study

Jorge Jovicich 1 Ludovico Minati 1 Moira Marizzoni 2 Rocco Marchitelli 1 Roser Sala-Llonch 3 David Bartrés-Faz 4, 3 Jennifer Arnold 5 Jens Benninghoff 5 Ute Fiedler 5 Luca Roccatagliata 6 Agnese Picco 7 Flavio Nobili 8 Oliver Blin 9 Stéphanie Bombois 10 Renaud Lopes 11 Regis Bordet 12 Julien Sein 13 Jean-Philippe Ranjeva 13 Mira Didic 14 Helene Gros-Dagnac 15 Pierre Payoux 15, 16 Giada Zoccatelli 17 Franco Alessandrini 17 Alberto Beltramello 17 Nuria Bargallo 3 Antonio Ferretti 18 Massimo Caulo 18 Marco Aiello 19 Carlo Cavaliere 19 Andrea Soricelli 19 Lucilla Parnetti 20 Roberto Tarducci 21 Piero Floridi 21 Magda Tsolaki 22 Manos Constantinidis 23 Antonios Drevelegas 23 Paolo Maria Rossini 24 Camillo Marra 24 Peter Schoenknecht 25 Tilman Hensch 25 Karl-Titus Hoffmann 25 Joost P. Kuijer 26 Pieter Jelle Visser 27 Frederik Barkhof 26 Giovanni B. Frisoni 2
Abstract : To date, limited data are available regarding the inter-site consistency of test-retest reproducibility of functional connectivity measurements, in particular with regard to integrity of the Default Mode Network (DMN) in elderly participants. We implemented a harmonized resting-state fMRI protocol on 13 clinical scanners at 3.0 T using vendor-provided sequences. Each site scanned a group of 5 healthy elderly participants twice, at least a week apart. We evaluated inter-site differences and test-retest reproducibility of both temporal signal-to-noise ratio (tSNR) and functional connectivity measurements derived from: i) seed-based analysis (SBA) with seed in the posterior cingulate cortex (PCC), ii) group independent component analysis (ICA) separately for each site (site ICA), and iii) consortium ICA, with group ICA across the whole consortium. Despite protocol harmonization, significant and quantitatively important inter-site differences remained in the tSNR of resting-state fMRI data; these were plausibly driven by hardware and pulse sequence differences across scanners which could not be harmonized. Nevertheless, the tSNR test-retest reproducibility in the consortium was high (ICC = 0.81). The DMN was consistently extracted across all sites and analysis methods. While significant inter-site differences in connectivity scores were found, there were no differences in the associated test-retest error. Overall, ICA measurements were more reliable than PCC-SBA, with site ICA showing higher reproducibility than consortium ICA. Across the DMN nodes, the PCC yielded the most reliable measurements (approximate to 4% test-retest error, ICC = 0.85), the medial frontal cortex the least reliable (approximate to 12%, ICC = 0.82) and the lateral parietal cortices were in between (site ICA). Altogether these findings support usage of harmonized multisite studies of resting-state functional connectivity to characterize longitudinal effects in studies that assess disease progression and treatment response. (C) 2015 Elsevier Inc. All rights reserved.
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Submitted on : Tuesday, January 3, 2017 - 3:56:09 PM
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Jorge Jovicich, Ludovico Minati, Moira Marizzoni, Rocco Marchitelli, Roser Sala-Llonch, et al.. Longitudinal reproducibility of default-mode network connectivity in healthy elderly participants: A multicentric resting-state fMRI study. NeuroImage, Elsevier, 2016, 124, pp.442--454. ⟨10.1016/j.neuroimage.2015.07.010⟩. ⟨hal-01425515⟩

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