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Table 2: Population means and 99% normal ranges (in parentheses) of MR parameter interquartile ranges across our population of healthy individuals. Data obtained at 3T.
Reconstruction Type T1 (ms) T2 (ms) MTR FA MD (×10⁴ mm²/s) λ₁ (×10⁴ mm²/s) λ₂ (×10⁴ mm²/s) λ₃ (×10⁴ mm²/s) λ_⊥ (×10⁴ mm²/s)
No. of individuals 11 17 15 20 20 20 20 20 20
Whole brain 340 (150, 530) 14 (0.20, 27) 0.044 (0.010, 0.078) 0.24 (0.17, 0.30) 1.4 (0.79, 2.0) 4.3 (3.1, 5.6) 2.1 (1.4, 2.8) 2.2 (1.5, 3.0) 2.0 (1.3, 2.6)
Hemispheres 320 (170, 460) 9.8 (4.6, 15) 0.037 (0.0013, 0.072) 0.23 (0.14, 0.32) 0.96 (0.47, 1.4) 3.9 (2.3, 5.5) 1.7 (1.1, 2.3) 1.9 (1.2, 2.5) 1.6 (0.99, 2.3)
Brain stem 170 (82, 260) 21 (−15, 57) 0.039 (0.017, 0.062) 0.18 (0.12, 0.25) 2.4 (0.60, 4.2) 3.9 (1.6, 6.2) 2.8 (1.4, 4.2) 2.8 (0.96, 4.6) 2.5 (1.0, 4.0)
Note:—MTR indicates magnetization transfer ratio; FA, fractional anisotropy; MD, mean diffusivity; λ_⊥, transverse diffusivity (average of λ₂ and λ₃).