Tinnitus is a condition characterized by the perception of auditory phantom sounds. It is known as the result of complex interactions between auditory and non-auditory regions. However, previous structural imaging studies on tinnitus patients showed evidence of significant white matter changes caused by hearing loss that is positively correlated with aging. Current study focused on which aspects of tinnitus pathologies affect the white matter integrity the most. We used diffusion tensor imaging technique to acquire images that have higher contrast in brain white matter, in order to analyze how white matter is influenced by tinnitus-related factors using voxel-based methods, region of interest analysis and deterministic tractography. As a result, white matter integrity in chronic tinnitus patients was both directly affected by age and also mediated by the hearing loss. The most important changes in white matter regions were found bilaterally in the anterior corona radiata, anterior corpus callosum, and bilateral sagittal strata. In the tractography analysis, the white matter integrity values in tracts of right parahippocampus were correlated with the subjective tinnitus loudness.
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