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Functional Magnetic Resonance Imaging fMRI with Auditory Stimulation in Songbirds
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A novel sequence to improve auditory functional MRI with variable silent delays.

Manoj Shrestha1, H Sean Lee2, Ulrike Nöth1

  • 1Brain Imaging Center (BIC), Goethe University Frankfurt, Frankfurt am Main, Germany.

Magnetic Resonance in Medicine
|September 5, 2020
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Summary

A new method called pre-Saturated EPI using Multiple delays in Steady-state (SEPIMS) allows for flexible auditory fMRI timing. This technique maintains signal stability with variable delays, matching conventional methods.

Keywords:
adiabatic saturationauditory fMRIscanner noisesparse imagingsteady-state conditionvariable silent delay

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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging (MRI)

Background:

  • Auditory functional MRI (fMRI) commonly uses silent delays between volume acquisitions for stimulus presentation.
  • Maintaining steady-state magnetization typically requires fixed inter-volume delays, limiting stimulus design flexibility.

Purpose of the Study:

  • To introduce and evaluate a novel acquisition scheme, pre-Saturated EPI using Multiple delays in Steady-state (SEPIMS).
  • To compare the signal stability of SEPIMS against conventional sparse EPI (CS-EPI) under variable inter-volume delay conditions.

Main Methods:

  • SEPIMS utilizes spin saturation pulses before each volume acquisition to ensure steady-state conditions, irrespective of prior spin history.
  • The saturation module's efficiency and impact on SEPIMS signal stability were assessed in vitro and in vivo.
  • Spoiler gradient pulses post-EPI readout were optimized to mitigate eddy-current-induced distortions.

Main Results:

  • SEPIMS demonstrated comparable signal stability to CS-EPI, even with significant variations in inter-volume delay durations.
  • Dual saturation pulses were found necessary for adequate saturation efficiency in tissues with long T1 values.
  • Optimization of spoiler gradients is crucial to prevent image artifacts.

Conclusions:

  • The SEPIMS sequence effectively maintains high signal stability despite variable inter-volume delays.
  • This enables more flexible stimulus design in auditory fMRI research.