Email updates

Keep up to date with the latest news and content from BMC Medical Imaging and BioMed Central.

Open Access Highly Accessed Research article

Imaging corticospinal tract connectivity in injured rat spinal cord using manganese-enhanced MRI

Mehmet Bilgen

Author Affiliations

High Field MRI Research Laboratory, The University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160, USA

Hoglund Brain Imaging Center, The University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160, USA

Molecular and Integrative Physiology, The University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160, USA

BMC Medical Imaging 2006, 6:15  doi:10.1186/1471-2342-6-15

Published: 17 November 2006

Abstract

Background

Manganese-enhanced MRI (MEI) offers a novel neuroimaging modality to trace corticospinal tract (CST) in live animals. This paper expands this capability further and tests the utility of MEI to image axonal fiber connectivity in CST of injured spinal cord (SC).

Methods

A rat was injured at the thoracic T4 level of the SC. The CST was labeled with manganese (Mn) injected intracortically at two weeks post injury. Next day, the injured SC was imaged using MEI and diffusion tensor imaging (DTI) modalities.

Results

In vivo MEI data obtained from cervical SC confirmed that CST was successfully labeled with Mn. Ex vivo MEI data obtained from excised SC depicted Mn labeling of the CST in SC sections caudal to the lesion, which meant that Mn was transported through the injury, possibly mediated by viable CST fibers present at the injury site. Examining the ex vivo data from the injury epicenter closely revealed a thin strip of signal enhancement located ventrally between the dorsal horns. This enhancement was presumably associated with the Mn accumulation in these intact fibers projecting caudally as part of the CST. Additional measurements with DTI supported this view.

Conclusion

Combining these preliminary results collectively demonstrated the feasibility of imaging fiber connectivity in experimentally injured SC using MEI. This approach may play important role in future investigations aimed at understanding the neuroplasticity in experimental SCI research.