Diffusivity and quantitative T1 profile of human visual white matter tracts after retinal ganglion cell damage
| Autor: | Hiroshi Horiguchi, Kenji Matsumoto, Hiromasa Takemura, Yoichiro Masuda, Shumpei Ogawa, Aviv Mezer, Tadashi Nakano, Atsushi Miyazaki, Keigo Shikishima |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Adult
Male Retinal Ganglion Cells Pathology medicine.medical_specialty genetic structures Optic tract Cognitive Neuroscience Optic Atrophy Hereditary Leber lcsh:Computer applications to medicine. Medical informatics lcsh:RC346-429 050105 experimental psychology White matter Optic neuropathy Young Adult 03 medical and health sciences Myelin 0302 clinical medicine medicine Humans Visual Pathways 0501 psychology and cognitive sciences Radiology Nuclear Medicine and imaging lcsh:Neurology. Diseases of the nervous system business.industry 05 social sciences Leber's hereditary optic neuropathy Regular Article medicine.disease White Matter eye diseases Diffusion Magnetic Resonance Imaging Diffusion Tensor Imaging medicine.anatomical_structure Neurology Retinal ganglion cell lcsh:R858-859.7 sense organs Neurology (clinical) business 030217 neurology & neurosurgery Diffusion MRI Optic radiation |
| Zdroj: | NeuroImage: Clinical, Vol 23, Iss, Pp-(2019) |
| ISSN: | 2213-1582 |
| DOI: | 10.1016/j.nicl.2019.101826 |
| Popis: | In patients with retinal ganglion cell diseases, recent diffusion tensor imaging (DTI) studies have revealed structural abnormalities in visual white matter tracts such as the optic tract, and optic radiation. However, the microstructural origin of these diffusivity changes is unknown as DTI metrics involve multiple biological factors and do not correlate directly with specific microstructural properties. In contrast, recent quantitative T1 (qT1) mapping methods provide tissue property measurements relatively specific to myelin volume fractions in white matter. This study aims to improve our understanding of microstructural changes in visual white matter tracts following retinal ganglion cell damage in Leber's hereditary optic neuropathy (LHON) patients by combining DTI and qT1 measurements. We collected these measurements from seven LHON patients and twenty age-matched control subjects. For all individuals, we identified the optic tract and the optic radiation using probabilistic tractography, and evaluated diffusivity and qT1 profiles along them. Both diffusivity and qT1 measurements in the optic tract differed significantly between LHON patients and controls. In the optic radiation, these changes were observed in diffusivity but were not evident in qT1 measurements. This suggests that myelin loss may not explain trans-synaptic diffusivity changes in the optic radiation as a consequence of retinal ganglion cell disease. Keywords: Leber's hereditary optic neuropathy, Optic radiation, Optic tract, White matter, Myelin, MRI |
| Databáze: | OpenAIRE |
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