Polarimetric images of human brain histological sections: impact of nerve fiber bundles crossing

Wide-field Imaging Mueller polarimetry (IMP) is capable to trace the in-plane orientation of brain fiber tracts by detecting the retardance of healthy brain white matter. IMP can help delineating brain tumor during neurosurgery, because tumor cells grow chaotically. However, the underlying crossing fibers may also affect the retardance of healthy brain. We measured with the transmission Mueller microscope two-layered stacks of thin sections of brain corpus callosum tissue. Brain fiber crossing induced the drop in the linear retardance values and azimuth randomization. The depolarization was invariant to mutual orientation of corpus callosum stripes, hence, the studies of brain tumor depolarization may help to distinguish brain tumor from the fiber crossing zones.