Image acquisition in a polarimetric setup. The optical filters (two linear polarizers and one quarter-wave retarder) are synchronously rotated relative to the brain section placed in-between. The birefringent fiber structures induce characteristic sinusoidal changes in the transmitted light intensity (left). Section- and pixel-wise analysis of the measured sinusoidal signals result in a color-coded description of fiber orientations referred to as fiber orientation map (right).
© INM-1, Forschungszentrum Jülich