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Magnetization transfer changes of grey and white matter in Parkinson's disease
N Tambasco1, G P Pelliccioli, P Chiarini
1Department of Neuroscience, University of Perugia, via Enrico dal Pozzo, 06126 Perugia, Italy. n.tambasco@libero.it
Abstract:
Since the attempt to evidence structural brain damage in Parkinson's disease (PD) by conventional magnetic resonance imaging (MRI) is usually disappointing, we have investigated whether the magnetization transfer ratio (MTR) can reflect changes in grey and white matter of PD patients. MTR was quantified in 44 regions of interest (ROIs) in both grey and white matter of 11 non-demented PD patients, ranging from 2 to 4 on the Hoehn and Yahr Scale, and eight age-matched healthy subjects. MTR differences between patients and controls were found in the supratentorial white matter and in the brainstem. In particular, lower MTR values were found in the paraventricular white matter of PD patients (p<0.05) while no differences were observed in corpus callosum, frontal, parietal, occipital lobes or centrum semiovalis. Lower MTR values were found in substantia nigra (p<0.001), red nucleus (p<0.05) and pons (p<0.05) of the patient group. No differences were discovered in basal ganglia and thalamus. These findings suggest that MTR measurements in the paraventricular white matter and brainstem may help to recognize a marker for probable PD.
Insights
Magnetization transfer ratio (MTR) imaging reveals subtle brain changes in Parkinson's disease (PD) patients. Lower MTR values in white matter and brainstem may serve as a potential biomarker for early PD detection.
Area of Science:
- Neuroimaging
- Neurology
- Biomarkers
Background:
- Conventional magnetic resonance imaging (MRI) often fails to detect structural brain damage in Parkinson's disease (PD).
- There is a need for sensitive imaging techniques to identify early pathological changes in PD.
- Magnetization transfer ratio (MTR) is a quantitative MRI technique sensitive to microstructural tissue alterations.
Purpose of the Study:
- To investigate whether MTR can detect grey and white matter changes in non-demented Parkinson's disease patients.
- To identify specific brain regions where MTR differences correlate with PD.
- To explore MTR as a potential imaging biomarker for probable PD.
Main Methods:
- Quantitative MTR analysis was performed in 44 regions of interest (ROIs) in both grey and white matter.
- The study included 11 non-demented PD patients (Hoehn and Yahr Scale 2-4) and 8 age-matched healthy controls.
- Statistical comparisons of MTR values were made between patient and control groups.
Main Results:
- MTR differences were observed in the supratentorial white matter and brainstem between PD patients and controls.
- Significantly lower MTR values were found in the paraventricular white matter (p<0.05) of PD patients.
- Lower MTR values were also detected in the substantia nigra (p<0.001), red nucleus (p<0.05), and pons (p<0.05) in the PD group.
Conclusions:
- MTR imaging can detect microstructural changes in the white matter and brainstem of Parkinson's disease patients.
- Reduced MTR in the paraventricular white matter and specific brainstem nuclei may serve as a potential imaging marker for probable PD.
- MTR offers a promising approach for identifying early, subtle brain alterations in Parkinson's disease.