Figure 6.

The reference voxel compared to a type A (+/+) voxel, CVR = 0.508. (A) The CVR map for an axial slice shows the position of the reference voxel (white cursors) and the type A +/+ voxel (purple cursors). (B) Similarly, the type map shows the positions of the chosen voxels. (C) The model flow responses to PetCO₂ for the type A +/+ voxel (purple open circles, blue type line fits) and the reference voxel (black open circles). The curves for the type A +/+ (purple line) and reference (black line) voxels were calculated from the model resistance sigmoidal responses. (D) The model resistance‐CO₂ responses calculated from the model flow responses for the type A +/+ voxel (purple open circles) and the reference voxel (black open circles). Sigmoid curves (lines) were fitted to the resistance‐CO₂ responses for each voxel. (E) The model branch pressure change with PetCO₂.