Glymphatic function and its influencing factors in different glucose metabolism states

Figure 1 Schematic illustration of the diffusion tensor image analysis method along the perivascular space. A: Schematic diagram showing the relationship between the direction of the perivascular space (gray cylinder) and the direction of the projection fibers (blue) and association fibers (green). Note that the orientation of the perivascular space is perpendicular to the projection and association fibers; B: Diffusion tensor image superimposed color shows the distribution of projection fibers (z-axis: Blue) and association fibers (y-axis: Green). Four regions of interest were placed on both sides of the projection fibers (projection region) and the association fibers (association region) to measure the diffusion coefficients in the three directions (x, y, and z axes).