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Functional connectivity density mapping: comparing multiband and conventional EPI protocols.

Alexander D Cohen1, Dardo Tomasi2, Ehsan Shokri-Kojori2

  • 1Department of Radiology, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, 53226, USA.

Brain Imaging and Behavior
|July 6, 2017
PubMed
Summary
This summary is machine-generated.

High-resolution multiband resting state fMRI improves functional connectivity density mapping (FCDM) quality. Seven-minute scans provide robust local functional connectivity density (lFCD) and global functional connectivity density (gFCD) measurements, enhancing clinical feasibility.

Keywords:
Functional MRIFunctional connectivityFunctional connectivity densityMultibandResting-stateSingle band

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Area of Science:

  • Neuroimaging
  • Brain Connectivity Analysis
  • Functional MRI

Background:

  • Functional connectivity density mapping (FCDM) quantifies brain connections.
  • Evaluating FCDM metrics like local (lFCD) and global (gFCD) functional connectivity density is crucial.

Purpose of the Study:

  • To assess the reproducibility, sensitivity, and specificity of lFCD and gFCD.
  • To compare high-resolution multiband (MB) with standard single-band (SB) rs-fMRI acquisitions.
  • To determine the robustness of 7-minute rs-fMRI scans for FCDM.

Main Methods:

  • Comparison of FCDM metrics between MB (2mm, TR 0.8s) and SB (3.5mm, TR 2.0s) rs-fMRI.
  • Utilized Human Connectome Project (HCP) compatible data.
  • Scanned subjects twice within two weeks using 7-minute rs-fMRI acquisitions.

Main Results:

  • MB acquisitions showed increased sensitivity and specificity compared to SB.
  • Reproducibility of FCDM metrics was maintained or improved with MB.
  • MB scans offered enhanced gray/white matter contrast, with similar lFCD/gFCD patterns across acquisition types.

Conclusions:

  • High-resolution MB rs-fMRI enhances FCDM data quality.
  • Short (7-minute) rs-fMRI scans yield reliable FCDM measurements.
  • FCDM is a robust technique applicable to clinically feasible scan durations and resolutions.