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High spatial resolution brain functional MRI using submillimeter balanced steady-state free precession acquisition.

Pei-Hsin Wu1, Ping-Huei Tsai, Ming-Long Wu

  • 1Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan.

Medical Physics
|December 11, 2013
PubMed
Summary

High-resolution functional MRI (fMRI) using balanced steady-state free precession (bSSFP) imaging significantly enhances signal detection in the brain. This technique allows for clearer visualization of fine cortical structures, improving fMRI studies without sacrificing functional contrast-to-noise ratios (fCNR).

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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging
  • Brain Function Analysis

Background:

  • Functional magnetic resonance imaging (fMRI) offers precise localization of neuronal activity.
  • Current fMRI voxel sizes (approx. 3x3x3 mm³) are adequate for basic functions but limit resolution of finer cortical structures.
  • Higher spatial resolution is crucial for detailed brain studies.

Purpose of the Study:

  • To investigate the impact of spatial resolution on fMRI experiments.
  • To evaluate the efficacy of balanced steady-state free precession (bSSFP) imaging at submillimeter voxel volumes (0.37 mm³).
  • To assess fMRI performance at 3.0 Tesla with high spatial resolution.

Main Methods:

  • Healthy subjects underwent fMRI with visual stimulation (5 Hz flashing checkerboard).
  • bSSFP imaging was performed at various frequency offsets for wider coverage.
  • Spatial resolution was varied by manipulating k-space data; functional activations were analyzed using the general linear model.

Main Results:

  • Reducing voxel volume from 3.44x3.44x2 mm³ to 0.43x0.43x2 mm³ increased functional activation signals from 7.7% to 20.9%.
  • Despite a threefold decrease in SNR, functional contrast-to-noise ratios (fCNR) remained nearly invariant.
  • High-resolution signals aligned with gray matter sulci, which might have been missed as noise at lower resolutions.

Conclusions:

  • The bSSFP sequence is suitable for submillimeter fMRI without compromising fCNR.
  • Reduced partial volume averaging at high spatial resolution preserves fCNR.
  • This technique is ideal for high-resolution applications, including resolving columnar brain organization.