Optical coherence tomography visualizes neurons in human entorhinal cortex.

Area of Science:

• Neuroscience
• Neuroanatomy
• Neuropathology

Background:

• Human brain cytoarchitecture is crucial for understanding neurological and neuropathological conditions.
• Traditional histology methods for assessing brain cytoarchitecture, such as Nissl staining, are prone to significant distortions.
• A need exists for advanced imaging techniques to accurately visualize neuronal structures in ex vivo human brain tissue.

Purpose of the Study:

• To evaluate the utility of optical coherence microscopy (OCM) for imaging human brain cytoarchitecture.
• To compare the information obtained from OCM with traditional Nissl staining.
• To demonstrate OCM's potential for distortion-free assessment of neuronal structures.

Main Methods:

• Utilized a previously established optical coherence microscopy technique to image individual neurons in ex vivo human entorhinal cortex tissue.
• Acquired en-face images of tissue blocks over 50 µm in depth.
• Registered OCM images with corresponding Nissl-stained slices using nonlinear transformation and segmented neurons for quantitative comparison.

Main Results:

• OCM imaging successfully captured detailed information about individual neurons in the human entorhinal cortex.
• Neuron segmentation in OCM images showed comparable results to Nissl staining.
• The study demonstrated that OCM provides cytoarchitectural information with minimal distortion.

Conclusions:

• Optical coherence microscopy is a viable technique for assessing ex vivo human brain cytoarchitecture with high fidelity.
• OCM offers a distortion-minimized alternative to traditional histological methods.
• Future integration with vibratomes could enable scalable, undistorted volumetric imaging of large human brain tissues.