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  Ultra-High Field MRI in Alzheimer's Disease: Effective Transverse Relaxation Rate and Quantitative Susceptibility Mapping of Human Brain In Vivo and Ex Vivo Compared to Histology

Tuzzi, E., Balla, D., Loureiro, J., Neumann, M., Laske, C., Pohmann, R., et al. (2020). Ultra-High Field MRI in Alzheimer's Disease: Effective Transverse Relaxation Rate and Quantitative Susceptibility Mapping of Human Brain In Vivo and Ex Vivo Compared to Histology. Journal of Alzheimer's Disease, 73(4), 1481-1499. doi:10.3233/JAD-190424.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-8464-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-B63B-C
Genre: Journal Article

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 Creators:
Tuzzi, E1, 2, Author              
Balla, DZ2, 3, Author              
Loureiro, JRA1, 2, Author              
Neumann, M, Author
Laske, C, Author
Pohmann, R1, 2, Author              
Preische, O, Author
Scheffler, K1, 2, Author              
Hagberg, G1, 2, Author              
Affiliations:
1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
3Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              

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 Abstract: Alzheimer’s disease (AD) is the most common cause of dementia worldwide. So far, diagnosis of AD is only unequivocally defined through postmortem histology. Amyloid plaques are a classical hallmark of AD and amyloid load is currently quantified by Positron Emission tomography (PET) in vivo. Ultra-high field magnetic resonance imaging (UHF-MRI) can potentially provide a non-invasive biomarker for AD by allowing imaging of pathological processes at a very-high spatial resolution. The first aim of this work was to reproduce the characteristic cortical pattern previously observed in vivo in AD patients using weighted-imaging at 7T. We extended these findings using quantitative susceptibility mapping (QSM) and quantification of the effective transverse relaxation rate (R2*) at 9.4T. The second aim was to investigate the origin of the contrast patterns observed in vivo in the cortex of AD patients at 9.4T by comparing quantitative UHF-MRI (9.4T and 14.1T) of postmortem samples with histology. We observed a distinctive cortical pattern in vivo in patients compared to healthy controls (HC), and these findings were confirmed ex vivo. Specifically, we found a close link between the signal changes detected by QSM in the AD sample at 14.1T and the distribution pattern of amyloid plaques in the histological sections of the same specimen. Our findings showed that QSM and R2* maps can distinguish AD from HC at UHF by detecting cortical alterations directly related to amyloid plaques in AD patients. Furthermore, we provided a method to quantify amyloid plaque load in AD patients at UHF non-invasively.

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 Dates: 2020-012020-02
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.3233/JAD-190424
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Title: Journal of Alzheimer's Disease
  Abbreviation : J. Alzheimers Dis.
Source Genre: Journal
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Affiliations:
Publ. Info: Amsterdam : IOS Press
Pages: - Volume / Issue: 73 (4) Sequence Number: - Start / End Page: 1481 - 1499 Identifier: ISSN: 1387-2877
CoNE: https://pure.mpg.de/cone/journals/resource/1387-2877