Olfactory Impairment in Parkinson's Disease Studied with Diffusion Tensor and Magnetization Transfer Imaging
(2017) In Journal of Parkinson's Disease 7(2). p.301-311- Abstract
BACKGROUND: Olfactory impairment is an early manifestation of Parkinson's disease (PD). Diffusion Tensor Imaging (DTI) and Magnetization Transfer (MT) are two imaging techniques that allow noninvasive detection of microstructural changes in the cerebral white matter.
OBJECTIVE: To assess white matter alterations associated with olfactory impairment in PD, using a binary imaging approach with DTI and MT.
METHODS: 22 PD patients and 13 healthy controls were examined with DTI, MT and an odor discrimination test. DTI data were first analyzed with tract-based spatial statistics (TBSS) in order to detect differences in fractional anisotropy, mean, radial and axial diffusivity between PD patients and controls. Voxelwise randomized... (More)
BACKGROUND: Olfactory impairment is an early manifestation of Parkinson's disease (PD). Diffusion Tensor Imaging (DTI) and Magnetization Transfer (MT) are two imaging techniques that allow noninvasive detection of microstructural changes in the cerebral white matter.
OBJECTIVE: To assess white matter alterations associated with olfactory impairment in PD, using a binary imaging approach with DTI and MT.
METHODS: 22 PD patients and 13 healthy controls were examined with DTI, MT and an odor discrimination test. DTI data were first analyzed with tract-based spatial statistics (TBSS) in order to detect differences in fractional anisotropy, mean, radial and axial diffusivity between PD patients and controls. Voxelwise randomized permutation was employed for the MT analysis, after spatial and intensity normalization. Additionally, ROI analysis was performed on both the DTI and MT data, focused on the white matter adjacent to olfactory brain regions.
RESULTS: Whole brain voxelwise analysis revealed decreased axial diffusivity in the left uncinate fasciculus and the white matter adjacent to the left olfactory sulcus of PD patients. ROI analysis demonstrated decreased axial diffusivity in the right orbitofrontal cortex, as well as decreased mean diffusivity and axial diffusivity in the white matter of the left entorhinal cortex of PD patients. There were no significant differences regarding fractional anisotropy, radial diffusivity or MT between patients and controls.
CONCLUSIONS: ROI analysis of DTI could detect microstructural changes in the white matter adjacent to olfactory areas in PD patients, whereas MT imaging could not.
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- author
- Georgiopoulos, Charalampos LU ; Warntjes, Marcel ; Dizdar, Nil ; Zachrisson, Helene ; Engström, Maria LU ; Haller, Sven and Larsson, Elna-Marie LU
- publishing date
- 2017
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Aged, Agnosia/complications, Brain/diagnostic imaging, Diffusion Tensor Imaging, Discrimination, Psychological, Female, Humans, Magnetic Resonance Imaging, Male, Olfactory Pathways/diagnostic imaging, Parkinson Disease/complications, White Matter/diagnostic imaging
- in
- Journal of Parkinson's Disease
- volume
- 7
- issue
- 2
- pages
- 301 - 311
- publisher
- IOS Press
- external identifiers
-
- scopus:85019387220
- pmid:28482644
- ISSN
- 1877-718X
- DOI
- 10.3233/JPD-161060
- language
- English
- LU publication?
- no
- id
- 9ccea0ab-e4ca-4edb-8e9a-0f4a7d0eba08
- date added to LUP
- 2023-02-09 11:21:18
- date last changed
- 2024-02-19 18:14:40
@article{9ccea0ab-e4ca-4edb-8e9a-0f4a7d0eba08,
abstract = {{<p>BACKGROUND: Olfactory impairment is an early manifestation of Parkinson's disease (PD). Diffusion Tensor Imaging (DTI) and Magnetization Transfer (MT) are two imaging techniques that allow noninvasive detection of microstructural changes in the cerebral white matter.</p><p>OBJECTIVE: To assess white matter alterations associated with olfactory impairment in PD, using a binary imaging approach with DTI and MT.</p><p>METHODS: 22 PD patients and 13 healthy controls were examined with DTI, MT and an odor discrimination test. DTI data were first analyzed with tract-based spatial statistics (TBSS) in order to detect differences in fractional anisotropy, mean, radial and axial diffusivity between PD patients and controls. Voxelwise randomized permutation was employed for the MT analysis, after spatial and intensity normalization. Additionally, ROI analysis was performed on both the DTI and MT data, focused on the white matter adjacent to olfactory brain regions.</p><p>RESULTS: Whole brain voxelwise analysis revealed decreased axial diffusivity in the left uncinate fasciculus and the white matter adjacent to the left olfactory sulcus of PD patients. ROI analysis demonstrated decreased axial diffusivity in the right orbitofrontal cortex, as well as decreased mean diffusivity and axial diffusivity in the white matter of the left entorhinal cortex of PD patients. There were no significant differences regarding fractional anisotropy, radial diffusivity or MT between patients and controls.</p><p>CONCLUSIONS: ROI analysis of DTI could detect microstructural changes in the white matter adjacent to olfactory areas in PD patients, whereas MT imaging could not.</p>}},
author = {{Georgiopoulos, Charalampos and Warntjes, Marcel and Dizdar, Nil and Zachrisson, Helene and Engström, Maria and Haller, Sven and Larsson, Elna-Marie}},
issn = {{1877-718X}},
keywords = {{Aged; Agnosia/complications; Brain/diagnostic imaging; Diffusion Tensor Imaging; Discrimination, Psychological; Female; Humans; Magnetic Resonance Imaging; Male; Olfactory Pathways/diagnostic imaging; Parkinson Disease/complications; White Matter/diagnostic imaging}},
language = {{eng}},
number = {{2}},
pages = {{301--311}},
publisher = {{IOS Press}},
series = {{Journal of Parkinson's Disease}},
title = {{Olfactory Impairment in Parkinson's Disease Studied with Diffusion Tensor and Magnetization Transfer Imaging}},
url = {{http://dx.doi.org/10.3233/JPD-161060}},
doi = {{10.3233/JPD-161060}},
volume = {{7}},
year = {{2017}},
}