Article Figures & Data
Figures
- Fig 1.
Brain extraction and CSF segmentation. A, Raw head CT image. B, Brain extracted image; volume = TIV (total intracranial volume). C, Thresholded to identify CSF. BPF = TIV–CSF volume/TIV.
- Fig 2.
A, Brain volume as a function of age and sex. B, Brain parenchymal fraction as a function of age and sex. C, Bar chart of brain volume with decade age grouping, with SDs. Gray bars indicate men; white bars, women. D, Bar chart of BPF with decade age grouping, with SDs. Gray bars indicate men; white bars, women.
- Fig 3.
A, Brain parenchymal radiodensity as a function of age and sex. B, Estimated brain radiomass (volume × radiodensity) as a function of age and sex.
- Fig 4.
Quantile regression of brain parenchymal fraction. Scatterplot of BPF as a function of age for female patients (A) and male patients (B). Quantile regression lines are drawn by polynomial curve fitting with 5th and 95th percentile as dashed lines, and 10th and 90th percentile as dotted lines. Polynomial coefficients are shown in Table 1.
Tables
Coefficients of polynomial regression models
Overall Men (0.05-Tile) Men (0.95-Tile) Women (0.05-Tile) Women (0.95-Tile) Intercept 0.86 8.32E-01 9.12E-01 8.11E-01 9.54E-01 Age –0.58 4.74E-03 –4.91E-05 5.21E-03 –3.13E-03 Age2 –0.13 –1.32E-04 3.21E-06 –1.19E-04 6.37E-05 Age3 0.04 7.63E-07 –1.15E-07 5.88E-07 –4.72E-07
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