Effective atomic number

1. Age is associated with effective atomic number in humans (nine of the 14 regions).

   “In contrast, Zeff exhibited weak to moderate positive correlations with age in nine of the 14 regions.”

   Humansbrainn = 30

   Electron Density and Effective Atomic Number of Normal-Appearing Adult Brain Tissues: Age-Related Changes and Correlation with Myelin Content

   Tomography (Ann Arbor, Mich.)·25 Aug 2025

1. Effective atomic number is associated with myelin partial volume in humans (ρ = -0.756).

   “Zeff exhibited a stronger negative correlation with Vmy (ρ = -0.756) than CTconv (ρ = -0.705) or ED (ρ = -0.491).”

   Humansbrainn = 30

   Electron Density and Effective Atomic Number of Normal-Appearing Adult Brain Tissues: Age-Related Changes and Correlation with Myelin Content

   Tomography (Ann Arbor, Mich.)·25 Aug 2025

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