Tractography at 3T MRI of Corpus Callosum Tracts Crossing White Matter Hyperintensities
Autor: | Angeles Garcia, Juan Fernandez-Ruiz, Angela C. Luedke, Justine Itorralba, Jennifer Reginold, William Reginold, Omar Islam |
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Rok vydání: | 2015 |
Předmět: |
Male
Pyramidal Tracts Corpus callosum 030218 nuclear medicine & medical imaging Corpus Callosum White matter 03 medical and health sciences 0302 clinical medicine Fractional anisotropy medicine Humans Radiology Nuclear Medicine and imaging Pyramidal tracts business.industry Adult Brain Radial diffusivity Anatomy White Matter Hyperintensity medicine.anatomical_structure Diffusion Magnetic Resonance Imaging Diffusion Tensor Imaging Anisotropy Female Neurology (clinical) business 030217 neurology & neurosurgery Tractography Diffusion MRI |
Zdroj: | AJNR Am J Neuroradiol |
ISSN: | 1936-959X |
Popis: | BACKGROUND AND PURPOSE: The impact of white matter hyperintensities on the diffusion characteristics of crossing tracts is unclear. This study used quantitative tractography at 3T MR imaging to compare, in the same individuals, the diffusion characteristics of corpus callosum tracts that crossed white matter hyperintensities with the diffusion characteristics of corpus callosum tracts that did not pass through white matter hyperintensities. MATERIALS AND METHODS: Brain T2 fluid-attenuated inversion recovery–weighted and diffusion tensor 3T MR imaging scans were acquired in 24 individuals with white matter hyperintensities. Tractography data were generated by the Fiber Assignment by Continuous Tracking method. White matter hyperintensities and corpus callosum tracts were manually segmented. In the corpus callosum, the fractional anisotropy, radial diffusivity, and mean diffusivity of tracts crossing white matter hyperintensities were compared with the fractional anisotropy, radial diffusivity, and mean diffusivity of tracts that did not cross white matter hyperintensities. The cingulum, long association fibers, corticospinal/bulbar tracts, and thalamic projection fibers were included for comparison. RESULTS: Within the corpus callosum, tracts that crossed white matter hyperintensities had decreased fractional anisotropy compared with tracts that did not pass through white matter hyperintensities ( P = .002). Within the cingulum, tracts that crossed white matter hyperintensities had increased radial diffusivity compared with tracts that did not pass through white matter hyperintensities ( P = .001). CONCLUSIONS: In the corpus callosum and cingulum, tracts had worse diffusion characteristics when they crossed white matter hyperintensities. These results support a role for white matter hyperintensities in the disruption of crossing tracts. |
Databáze: | OpenAIRE |
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