Effects of different scan duration on brain effective connectivity among default mode network nodes

Wahab, Nor Shafiza Abdul and Yahya, Noorazrul and Yusoff, Ahmad Nazlim and Zakaria, Rozman and Thanabalan, Jegan and Othman, Elza and Hong, Soon Bee and Kumar, Ramesh Kumar Athi and Manan, Hanani Abdul (2022) Effects of different scan duration on brain effective connectivity among default mode network nodes. Diagnostics, 12 (5). ISSN 2075-4418, DOI https://doi.org/10.3390/diagnostics12051277.

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Background: Resting-state functional magnetic resonance imaging (rs-fMRI) can evaluate brain functional connectivity without requiring subjects to perform a specific task. This rs-fMRI is very useful in patients with cognitive decline or unable to respond to tasks. However, long scan durations have been suggested to measure connectivity between brain areas to produce more reliable results, which are not clinically optimal. Therefore, this study aims to evaluate a shorter scan duration and compare the scan duration of 10 and 15 min using the rs-fMRI approach. Methods: Twenty-one healthy male and female participants (seventeen right-handed and four left-handed), with ages ranging between 21 and 60 years, were recruited. All participants underwent both 10 and 15 min of rs-fMRI scans. The present study evaluated the default mode network (DMN) areas for both scan durations. The areas involved were the posterior cingulate cortex (PCC), medial prefrontal cortex (mPFC), left inferior parietal cortex (LIPC), and right inferior parietal cortex (RIPC). Fifteen causal models were constructed and inverted using spectral dynamic causal modelling (spDCM). The models were compared using Bayesian Model Selection (BMS) for group studies. Result: The BMS results indicated that the fully connected model was the winning model among 15 competing models for both 10 and 15 min scan durations. However, there was no significant difference in effective connectivity among the regions of interest between the 10 and 15 min scans. Conclusion: Scan duration in the range of 10 to 15 min is sufficient to evaluate the effective connectivity within the DMN region. In frail subjects, a shorter scan duration is more favourable.

Item Type: Article
Funders: Research University Grant Universiti Kebangsaan Malaysia (UKM) [Grant No: GGPM-2017-016]
Uncontrolled Keywords: Resting-state functional MRI; Scan duration; Functional connectivity
Subjects: R Medicine > R Medicine (General)
R Medicine > RC Internal medicine
Divisions: Faculty of Medicine
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 13 Oct 2023 06:51
Last Modified: 13 Oct 2023 06:51
URI: http://eprints.um.edu.my/id/eprint/42248

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