# Corticospinal Tract (CST) reconstruction based on fiber orientation distributions(FODs) tractography

## TL;DR

This paper presents a novel method for reconstructing the corticospinal tract (CST) using fiber orientation distributions (FODs) tractography, which improves anatomical accuracy over traditional tensor-based methods, aiding spinal cord injury treatment.

## Contribution

The study introduces FODs tractography for CST reconstruction, utilizing spherical harmonics and manual ROI delineation to enhance anatomical detail compared to tensor-based approaches.

## Key findings

- FODs tractography reveals more accurate CST fiber bundles.
- The method outperforms tensor-based tractography in anatomical correctness.
- Manual ROI delineation effectively supports CST reconstruction.

## Abstract

The Corticospinal Tract (CST) is a part of pyramidal tract (PT), and it can innervate the voluntary movement of skeletal muscle through spinal interneurons (the 4th layer of the Rexed gray board layers), and anterior horn motorneurons (which control trunk and proximal limb muscles). Spinal cord injury (SCI) is a highly disabling disease often caused by traffic accidents. The recovery of CST and the functional reconstruction of spinal anterior horn motor neurons play an essential role in the treatment of SCI. However, the localization and reconstruction of CST are still challenging issues; the accuracy of the geometric reconstruction can directly affect the results of the surgery. The main contribution of this paper is the reconstruction of the CST based on the fiber orientation distributions (FODs) tractography. Differing from tensor-based tractography in which the primary direction is a determined orientation, the direction of FODs tractography is determined by the probability. The spherical harmonics (SPHARM) can be used to approximate the efficiency of FODs tractography. We manually delineate the three ROIs (the posterior limb of the internal capsule, the cerebral peduncle, and the anterior pontine area) by the ITK-SNAP software, and use the pipeline software to reconstruct both the left and right sides of the CST fibers. Our results demonstrate that FOD-based tractography can show more and correct anatomical CST fiber bundles.