Detection of scale-freeness in brain connectivity by functional MRI: Signal processing aspects and implementation of an open hardware co-processor

Ludovico Minati, Anna Nigri, Mara Cercignani, Dennis Chan

Research output: Contribution to journalArticle

Abstract

An outstanding issue in graph-theoretical studies of brain functional connectivity is the lack of formal criteria for choosing parcellation granularity and correlation threshold. Here, we propose detectability of scale-freeness as a benchmark to evaluate time-series extraction settings. Scale-freeness, i.e., power-law distribution of node connections, is a fundamental topological property that is highly conserved across biological networks, and as such needs to be manifest within plausible reconstructions of brain connectivity. We demonstrate that scale-free network topology only emerges when adequately fine cortical parcellations are adopted alongside an appropriate correlation threshold, and provide the full design of the first open-source hardware platform to accelerate the calculation of large linear regression arrays.

Original languageEnglish
Pages (from-to)1525-1531
Number of pages7
JournalMedical Engineering and Physics
Volume35
Issue number10
DOIs
Publication statusPublished - Oct 2013

Keywords

  • Functional connectivity
  • Functional magnetic resonance imaging (fMRI)
  • Graph-based analysis
  • Network topology
  • Parallel processing
  • Scale freeness

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biophysics

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