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Summary
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Quantitative Susceptibility Mapping (QSM) reveals a strong link between brain iron levels and magnetic susceptibility in older adults. This finding may help estimate iron concentrations non-invasively for neurodegenerative disease research.

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Area of Science:

  • Neuroimaging
  • Neuroscience
  • Biomarkers

Background:

  • Quantitative Susceptibility Mapping (QSM) is vital for understanding brain iron homeostasis and abnormalities.
  • The relationship between post-mortem iron levels and in-vivo magnetic susceptibility, particularly in cortical regions, is not well-understood.
  • This study investigates the connection between cortical magnetic susceptibility and iron concentration in older adults.

Purpose of the Study:

  • To examine the relationship between cortical magnetic susceptibility and iron levels in community-based older adults.
  • To determine if in-vivo QSM can estimate post-mortem iron concentrations in the brain cortex.
  • To explore the potential of QSM in studying iron dysregulation in neurodegenerative diseases.

Main Methods:

  • Utilized 3D multi-echo gradient echo (ME-GRE) data from 20 community-based older adults (ages 71-101).
  • Reconstructed susceptibility maps using the Morphology Enabled Dipole Inversion (MEDI) algorithm.
  • Measured iron concentrations via inductively coupled plasma mass spectrometry in autopsy-derived cortical tissue samples (ACC, MFC, ITC) and correlated with in-vivo QSM data.

Main Results:

  • A significant positive association was found between magnetic susceptibility and iron levels in cortical regions.
  • Multiple linear regression, controlling for age, sex, and antemortem interval, showed R² = 0.83 (p < 0.05).
  • Pairwise correlation analysis confirmed strong relationships between iron levels and magnetic susceptibility.

Conclusions:

  • Established a significant positive association between in-vivo cortical magnetic susceptibility and post-mortem iron levels.
  • Suggests QSM can potentially estimate brain iron concentrations.
  • Highlights QSM's utility for future research on iron dysregulation in neurodegenerative conditions.