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Related Experiment Video

Updated: Jul 14, 2026

Simultaneous fMRI and Electrophysiology in the Rodent Brain
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Awake rodent fMRI: Gradient-echo echo planar imaging versus compressed-sensing fast low-angle shot.

Christopher Cover1,2, Sujatha Reddy1, Alberto Vazquez1,2

  • 1Department of Radiology, University of Pittsburgh, McGowan Institute for Regenerative Medicine Building, Pittsburgh, PA, United States.

Imaging Neuroscience (Cambridge, Mass.)
|August 13, 2025
PubMed
Summary

Gradient-echo echo planar imaging (GE-EPI) shows higher sensitivity for detecting brain activation in awake rodent fMRI compared to compressed-sensing fast low-angle shot (CS-FLASH). GE-EPI offers better contrast-to-noise ratio for hemodynamic activity, despite CS-FLASH producing sharper images.

Keywords:
CBVw fMRIawake rodent fMRIfunctional pulse sequence comparisonhigh-resolution fMRIolfactory bulb

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Area of Science:

  • Neuroimaging
  • Functional Magnetic Resonance Imaging (fMRI)
  • Rodent Models

Background:

  • Awake rodent fMRI is a valuable tool for studying neuronal activity at whole-brain and laminar scales.
  • Optimization of acclimation, paradigms, and hardware is ongoing, but pulse sequence impact remains understudied.

Purpose of the Study:

  • To compare gradient-echo echo planar imaging (GE-EPI) and compressed-sensing fast low-angle shot (CS-FLASH) pulse sequences for detecting hemodynamic activity in awake rodent fMRI.
  • To evaluate sensitivity to brain activation using cerebral blood volume-weighted (CBVw) contrast enhancement in the olfactory bulb.

Main Methods:

  • Comparison of GE-EPI and CS-FLASH pulse sequences in awake rodents.
  • Utilized cerebral blood volume-weighted (CBVw) contrast enhancement.
  • Investigated hemodynamic activity in the olfactory bulb.
  • Analyzed motion parameters and image quality, including framewise displacement and spatial correlation censoring.

Main Results:

  • CS-FLASH exhibited comparable motion parameters to GE-EPI but was more susceptible to motion-induced image corruption.
  • GE-EPI demonstrated a consistently greater contrast-to-noise ratio (CNR) for odor activation than CS-FLASH.
  • CS-FLASH produced sharper images and equivalent spatial activation patterns to GE-EPI, but with lower statistical strength and detection sensitivity.

Conclusions:

  • GE-EPI is more sensitive for detecting hemodynamic brain activation in awake rodent fMRI compared to CS-FLASH.
  • CS-FLASH offers sharper images but reduced CNR and statistical power for detecting activation.
  • Pulse sequence choice significantly impacts the sensitivity and reliability of awake rodent fMRI studies.