Article Figures & Data
Figures
- Fig 1.
Representative examples of maps of the venous sinus tree. A, Maximum-intensity projection of a 3D PC-MRA source image. B, The venous sinus tree segmentation was produced by Mimics software.
- Fig 2.
Schematic representation of the modeled venous system. S. indicates sinus.
- Fig 3.
An example of phase-contrast MR imaging showing the 2 IJVs (at the C2–C3 vertebrae) and typical flow curves over the cardiac cycle in 1 participant. The curve marked with triangles shows the total mean flow through the left and right IJVs.
- Fig 4.
The relationship between mean flow and calculated Rd on the left (left panel) and right (middle panel) sides of the venous sinus tree. The vessels of the left and right sides, respectively, comprise the 3 left or right vessel segments (the transverse sinus, sigmoid sinus, and IJV). The right panel shows the relationship between total mean flow and the overall Rd.
- Fig 5.
Flow AIs plotted against resistance AIs. Diamonds located below the horizontal gray band (AI < −0.2) reflect right-sided flows, and those above the horizontal gray band (AI > +0.2) reflect left-sided flows. Diamonds located to the left of the vertical gray band (AI < −0.2) reflect right-sided resistance, and those on the right of the vertical gray band (AI > +0.2) reflect left-sided resistance.
Tables
Values of the mean Rd of blood in the study population of healthy adults
Mean Rd (Pa s/cm3) Superior sagittal sinus 20.1 ± 6 Straight sinus 41.2 ± 21 Transverse sinus Left 21.5 ± 14 Right 8.5 ± 5 Sigmoid sinus Left 11.6 ± 6 Right 4.8 ± 3 Internal jugular vein Left 8.5 ± 7 Right 5.1 ± 4 Overall Rd 23.8 ± 7
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