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Use of computational fluid dynamics for 3D fiber tract visualization on human high-thickness histological slices: histological mesh tractography

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Abstract

Understanding the intricate three-dimensional relationship between fiber bundles and subcortical nuclei is not a simple task. It is of paramount importance in neurosciences, especially in the field of functional neurosurgery. The current methods for in vivo and post mortem fiber tract visualization have shortcomings and contributions to the field are welcome. Several tracts were chosen to implement a new technique to help visualization of white matter tracts, using high-thickness histology and dark field images. Our study describes the use of computational fluid dynamic simulations for visualization of 3D fiber tracts segmented from dark field microscopy in high-thickness histological slices (histological mesh tractography). A post mortem human brain was MRI scanned prior to skull extraction, histologically processed and serially cut at 430 µm thickness as previously described by our group. High-resolution dark field images were used to segment the outlines of the structures. These outlines served as basis for the construction of a 3D structured mesh, were a Finite Volume Method (FVM) simulation of water flow was performed to generate streamlines representing the geometry. The simulations were accomplished by an open source computer fluid dynamics software. The resulting simulation rendered a realistic 3D impression of the segmented anterior commissure, the left anterior limb of the internal capsule, the left uncinate fascicle, and the dentato-rubral tracts. The results are in line with clinical findings, diffusion MR imaging and anatomical dissection methods.

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Acknowledgments

The authors would like to thank the team participating on the São Paulo-Würzburg collaborative project. This includes all members of the Brain Bank of the Brazilian Aging Brain Research Group (BBBABSG) of the University of São Paulo Medical School, Mrs. E. Broschk and Mrs. A. Bahrke from the Morphological Brain Research Unit of the University of Würzburg, Germany.

Funding

This study was supported by resources from the University of Sao Paulo School of Medicine, Brazil and University of Würzburg, Germany. The author Eduardo Joaquim Lopes Alho was supported by a scholarship from CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) agency, Brazil, for doctoral studies at the University of Würzburg, Germany. The authors do not have personal financial or institutional interest in any of the drugs, materials, or devices described in this article.

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Correspondence to Eduardo Joaquim Lopes Alho.

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The authors disclose any actual or potential conflict of interest including any financial, personal or other relationships with other people or organizations within three years of beginning the submitted work that could inappropriately influence, or be perceived to influence, their work.

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The work described has been carried out in accordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki).

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Alho, E.J.L., Fonoff, E.T., Di Lorenzo Alho, A.T. et al. Use of computational fluid dynamics for 3D fiber tract visualization on human high-thickness histological slices: histological mesh tractography. Brain Struct Funct 226, 323–333 (2021). https://doi.org/10.1007/s00429-020-02187-3

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  • DOI: https://doi.org/10.1007/s00429-020-02187-3

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