Multisite fMRI reproducibility of a motor task using identical MR systems |
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Authors: | Costafreda Sergi G Brammer Michael J Vêncio Ricardo Z N Mourão Maria L Portela Luiz A P de Castro Claudio Campi Giampietro Vincent P Amaro Edson |
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Institution: | Brain Image Analysis Unit, Institute of Psychiatry, King's College London, UK. s.costafreda@iop.kcl.ac.uk |
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Abstract: | PURPOSE: To estimate between-scanner functional MRI (fMRI) reproducibility in a multisite study. MATERIALS AND METHODS: A total of five identical 1.5T MR systems were used to repeatedly scan five subjects while performing a finger tapping task. A two-way (scanners, subjects) random effects analysis of variance (ANOVA) was used to estimate between-scanner and between-subject variability on two outcome variables: task-related mean blood oxygenation level dependent (BOLD) signal change and volume of activation within a motor region-of-interest (ROI). RESULTS: Between-scanner variability of fMRI data accounted for a small proportion of the total variation in the BOLD signal change (8.34%, P = 0.114) and volume of activation (5.46%, P = 0.203). Between-subject variation accounted for more than half of the total variation for both measurements (57.17% and 54.46%, respectively, P < 0.01). CONCLUSION: These results support the feasibility of multisite studies using identical scanner systems. |
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Keywords: | fMRI multisite studies reproducibility of results variance components analysis motor task |
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