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Quantitative Susceptibility Mapping with Source Separation in Normal Brain Development of Newborns.

MinJung Jang1, Alexey V Dimov1, Kushal Kapse2

  • 1From the Department of Radiology (M.J., A.V.D., Y.W., P.S., T.D.N., Z.Z.), Weill Cornell Medicine, New York, New York.

AJNR. American Journal of Neuroradiology
|September 4, 2024
PubMed
Summary
This summary is machine-generated.

Quantitative susceptibility mapping (QSM) with source separation reveals regional variations in neonatal brain iron and myelin. This method aids in early detection of developmental abnormalities like delayed myelination or iron deficiency.

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Area of Science:

  • Neuroimaging
  • Biophysics
  • Developmental Neuroscience

Background:

  • Quantitative susceptibility mapping (QSM) is crucial for assessing brain tissue composition, including myelination and iron deposition.
  • Challenges exist in neonate brain analysis due to opposing susceptibility signals (myelin: negative, iron: positive) within the same voxel.
  • Susceptibility source separation is a novel approach to address these challenges in the developing brain.

Purpose of the Study:

  • To measure positive and negative magnetic susceptibility sources in the healthy neonate brain using QSM with susceptibility source separation.
  • To characterize regional variations and age-related changes in susceptibility in key brain structures.
  • To evaluate the potential of this technique for identifying early signs of abnormal myelination or iron levels.

Main Methods:

  • Sixty-nine healthy neonates underwent MRI with gradient-echo imaging for QSM.
  • Susceptibility source separation was performed using R2* data and linear modeling.
  • Mean susceptibility values were calculated for various brain regions (GM, WM, deep GM nuclei, lobes) after atlas-based normalization.

Main Results:

  • Sixty-five neonates were analyzed, showing distinct susceptibility patterns in different brain regions.
  • White matter (WM) had lower positive and higher negative susceptibility than gray matter (GM).
  • Regional differences were observed in the thalamus, putamen, globus pallidus, and brain lobes, with some correlating with neonate age.

Conclusions:

  • The study highlights regional and temporal variations in neonatal brain susceptibility, linked to myelination and iron deposition.
  • QSM with source separation shows promise for the early detection of myelination delays or iron deficiency in infants.
  • This technique offers valuable insights into normal brain development and potential deviations.