Article Figures & Data
Figures
- FIG 1.
Change in brain parenchymal fraction through the life span, men (filled) and women (unfilled). This figure summarizes the findings further detailed in Cauley et al.7
- FIG 2.
A, Segmentation of T1-weighted MR image of the brain, reprinted with permission from Despotović et al.27 B, Segmentation of a brain CT image, reprinted with permission from Cauley et al.6
- FIG 3.
Quantile regression of adult brain parenchymal fraction (men, left and women, right) as a function of age. Quantile regression of adult brain mass (men, left and women, right) as a function of age.
- FIG 4.
The effects of image rotation on radiodensity histogram and volumetrics of brain CT images. A, Original image. Volume calculated 1565 mL. B, Image rotated 15° to the right. Volume calculated 1602 mL. C, Rotated image registered to standard brain MR imaging template in FSL to restore image to nonrotated orientation. Volume calculated 2022 mL.
- FIG 5.
Beam-hardening by the skull is seen in routine clinical head CT. These images were acquired on 11/14/2018 from a standard hospital GE Healthcare scanner for acute trauma. For the image pair on the left the default display window settings were used (window width/window length 125/40). For the image pair on the right (same case), the display window settings were window width/window length 17/42. This persistent beam-hardening artifact can impact the interpretation of cortical lesions and is particularly important when performing quantitative, digital analysis.
- FIG 6.
Image inhomogeneity seen on routine MR images of the brain, with image intensity inhomogeneity–corrected image on the right. Reproduced with permission from Vovk et al.44
- FIG 7.
FSL “Bias field reduction” corrects for the attenuation and scatter artifacts seen on routine clinical head CT images. Subject with a thick skull and normal head CT (A). Brain-extracted image (B). Segmented GM images with “bias field correction” “turned off” (C), and with bias field “on” at default settings (D). The magnitude of the correction in HU, color-scaled as per the color bar at the bottom (E). Reproduced with permission from Cauley et al.6
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