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European Radiology

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19.02.2018 | Magnetic Resonance

Progressive supranuclear palsy and idiopathic Parkinson’s disease are associated with local reduction of in vivo brain viscoelasticity

verfasst von: Axel Lipp, Cornelia Skowronek, Andreas Fehlner, Kaspar-Josche Streitberger, Jürgen Braun, Ingolf Sack

Erschienen in: European Radiology | Ausgabe 8/2018

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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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Titel: Progressive supranuclear palsy and idiopathic Parkinson’s disease are associated with local reduction of in vivo brain viscoelasticity
verfasst von: Axel Lipp
Cornelia Skowronek
Andreas Fehlner
Kaspar-Josche Streitberger
Jürgen Braun
Ingolf Sack
Publikationsdatum: 19.02.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: European Radiology / Ausgabe 8/2018
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-017-5269-y

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Progressive supranuclear palsy and idiopathic Parkinson’s disease are associated with local reduction of in vivo brain viscoelasticity