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Maximizing sensitivity for fast GABA edited spectroscopy in the visual cortex at 7 T.

Arjan D Hendriks1, Alessio Fracasso1,2, Catalina S Arteaga de Castro1

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|February 15, 2018
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Summary

This study developed a faster, more sensitive method for measuring GABA in the visual cortex using 7T MRI. The new technique improves signal-to-noise ratio, enabling functional GABA detection closer to the timescale of brain activity.

Keywords:
MEGA-sLASERfMRSfast edited spectroscopyhalf volume coilvisual cortexγ-aminobutyric acid (GABA)

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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Spectroscopy
  • Human Visual Cortex

Background:

  • Functional MRI (fMRI) and MRS can link BOLD imaging to neuronal metabolism at high field strengths.
  • Current GABA-edited spectroscopy scan times (6-30 min) are too long for fMRI-observed functional changes.

Purpose of the Study:

  • To reduce scan time and enhance GABA sensitivity for edited spectroscopy in the human visual cortex.
  • To achieve functional GABA detection closer to the physiological timescale of BOLD cortex activation.

Main Methods:

  • Developed a dedicated 7T setup for combined fMRI and GABA MRS.
  • Utilized a half-volume multi-transmit coil, high-density receive arrays, and an optimized MEGA-sLASER sequence.
  • Increased visual cortex activation by adjusting the participant's viewing angle to enlarge the activated tissue volume.

Main Results:

  • Achieved a 2.2-fold increase in average SNR for GABA detection compared to conventional setups.
  • Demonstrated stable GABA detection with fewer than 16 signal averages (1 min 23 s total).
  • Verified setup stability for 5% GABA accuracy using a phantom; in vivo variations ranged from 14-25%.

Conclusions:

  • The optimized setup significantly improves GABA sensitivity and reduces scan time.
  • Functional GABA detection is now feasible at a temporal resolution closer to BOLD activation dynamics.
  • This advancement facilitates better understanding of neuronal metabolism and brain function.