Abstract
Objectives
To apply three-dimensional multifrequency MR-elastography (3DMRE) for the measurement of local cerebral viscoelasticity changes in patients with Parkinson's disease (PD) and progressive supranuclear palsy (PSP).
Methods
T1-weighted anatomical imaging and 3DMRE were performed in 17 PD and 20 PSP patients as well as 12 controls. Two independent viscoelasticity parameters, |G*| and φ, were reconstructed combining seven harmonic vibration frequencies (30–60 Hz). Spatially averaged values were compared by one-way ANOVA, groups were compared using unpaired t test and Mann-Whitney test, respectively. Correlation between clinical data and parameters of brain elasticity and volume were calculated by Pearson’s correlation coefficient.
Results
In patients, |G*| was significantly reduced in the frontal and mesencephalic regions (p < 0.05). Beyond that, reduced mesencephalic |G*| discriminated PSP from PD (p < 0.05). Neurodegeneration causes significant brain atrophy (p < 0.01) and is pronounced in PSP patients (p < 0.05 vs. PD). Reduced brain viscoelasticity is correlated with brain atrophy in PSP (r=0.64, p=0.002) and PD (r=0.65, p=0.005) patients but not in controls.
Conclusions
MRE-measured viscoelasticity reflects local structural changes of brain tissue in PSP and in PD and provides a useful parameter to differentiate neurodegenerative movement disorders based on imaging examinations.
Key points
• 3D multifrequency MR-elastography reveals diffuse regional changes in brain viscoelasticity in neurodegenerative disorders.
• Reduced mesencephalic viscoelasticity separates PD and PSP.
• Reduced brain viscoelasticity and brain atrophy as independent hallmarks of neurodegeneration hypothesized.
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Abbreviations
- |G*|:
-
Magnitude of the complex shear modulus
- 3DMRE:
-
Three-dimensional magnetic resonance elastography
- FoV:
-
Field of view
- GM, WM:
-
Cortical grey matter, white matter
- MEG:
-
Motion-encoding gradients
- MRE:
-
Magnetic resonance elastography
- PD:
-
Parkinson’s disease
- PSP:
-
Progressive supranuclear palsy
- PSPRS:
-
PSP rating scale
- ROI:
-
Regions-of-interest
- UPDRS part III :
-
Motor part of the MDS-Unified Parkinson’s Disease Rating Scale
- φ:
-
Phase angle of the complex shear modulus
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Funding
This study has received funding by the German Research Foundation (DFG Sa901/17) to Ingolf Sack. Parts of the study were supported by the European Union’s Horizon 2020 Programme (ID 668039, EU FORCE – Imaging the Force of Cancer) and German Federal Ministry of Education and Research (BMBF 01GQ1408)
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The scientific guarantor of this publication is Ingolf Sack.
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The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
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No complex statistical methods were necessary for this paper.
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Institutional Review Board approval was obtained.
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Written informed consent was obtained from all subjects in this study.
Methodology
• prospective
• observational
• performed at one institution.
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Lipp, A., Skowronek, C., Fehlner, A. et al. Progressive supranuclear palsy and idiopathic Parkinson’s disease are associated with local reduction of in vivo brain viscoelasticity. Eur Radiol 28, 3347–3354 (2018). https://doi.org/10.1007/s00330-017-5269-y
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DOI: https://doi.org/10.1007/s00330-017-5269-y