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Complementary Sensitivity of Fixed-Time and Fixed-Oscillation Regimes to Exchange and Structural Disorder in the

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Summary

Fixed-duration and fixed-oscillation oscillating-gradient spin-echo (OGSE) diffusion MRI reveal distinct human brain microstructural properties. Fixed-duration OGSE highlights structural disorder, while fixed-oscillation OGSE probes membrane permeability and exchange.

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Area of Science:

  • Neuroimaging
  • Diffusion MRI
  • Biophysics

Background:

  • Oscillating-gradient spin-echo (OGSE) diffusion MRI is sensitive to cell geometry and membrane integrity via frequency-dependent kurtosis.
  • Previous studies reported inconsistent findings due to variations in frequency manipulation.
  • Understanding these variations is crucial for accurate microstructural analysis.

Purpose of the Study:

  • To compare frequency-dependent kurtosis in the human brain under two distinct OGSE regimes: fixed total waveform duration (fixed-T) and fixed number of oscillations (fixed-N).
  • To investigate how these different frequency variation methods impact the sensitivity to microstructural features.

Main Methods:

  • Eleven healthy volunteers underwent 3T Connectome 2.0 MRI with OGSE using 500 mT/m gradients.
  • Mean kurtosis (MK) was measured using fixed-T (approx. 80 ms) and fixed-N (N=1) waveforms.
  • The adiabatic Kärger exchange model was applied to MK in white matter (WM) and gray matter (GM) regions to estimate microstructural parameters.

Main Results:

  • Fixed-T OGSE showed decreasing MK with frequency in both WM and GM, indicating sensitivity to structural disorder.
  • Fixed-N OGSE exhibited increasing MK with frequency in GM and a flatter trend in WM, suggesting greater sensitivity to water exchange.
  • WM showed longer water exchange time, higher intracellular fraction, and greater extracellular tortuosity compared to GM.

Conclusions:

  • Fixed-T and fixed-N OGSE provide complementary insights into human brain microstructure.
  • Fixed-T OGSE emphasizes structural disorder, while fixed-N OGSE highlights membrane permeability and exchange.
  • The use of extended frequency regimes with ultra-strong gradients enhances OGSE's utility for probing brain tissue microstructure.