Abstract
Background
To differentiate dementia with Lewy bodies (DLB) from Alzheimer disease (AD) using a single imaging modality is challenging, because of their common hypometabolic findings. Scaled subprofile modeling/principal component analysis (SSM/PCA), an unsupervised artificial intelligence, has the potential to offer an alternative to image analysis.
Objective
We aimed to produce spatial metabolic profiles to discriminate DLB from AD and to identify the characteristics of the profiles.
Methods
Fifty individuals each with DLB, AD, and normal cognition (NL) underwent 18F-FDG-PET and MRI. The spatial metabolic profile to differentiate DLB from AD (DLB-AD discrimination profile) was determined using SSM/PCA with tenfold cross validation. For comparison, we also produced disease-related profiles that can discriminate AD and DLB from NL (AD- and DLB-related profiles, respectively).
Results
The DLB-AD discrimination profile significantly differentiated DLB from AD with comparable accuracy to that of discriminating DLB and AD from NL. The AD- and DLB-related profiles comprised metabolic imaging features typical of each pathology. In contrast, the DLB-AD discrimination profile emphasized preservation in the posterior cingulate cortex (cingulate island sign) and medial temporal lobe, and occipital hypometabolism. Common hypometabolic findings between DLB and AD were less noticeable in the profile. The DLB-related profile significantly correlated with cognitive function and three core features of DLB, whereas the DLB-AD discrimination profile did not.
Conclusions
Spatial metabolic profile that could discriminate DLB from AD emphasized different imaging features and eliminated common findings between DLB and AD. Neither cognitive function nor core features were associated with the profile.
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We are grateful for the use of the ScAnVP software ©2019 developed at the Feinstein Institute for Medical Research.
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TI study design, data collection, statistical analysis, and manuscript preparation. MK study design and manuscript preparation.
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This study proceeded according to the ethical standards of Fukujuji Hospital that conform to the Declaration of Helsinki (2013). All procedures were approved by the Ethics Review Board at Fukujuji Hospital. All healthy volunteers, patients and their families provided written informed consent to participate after receiving a detailed explanation about the purpose and protocols of the study.
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Iizuka, T., Kameyama, M. Spatial metabolic profiles to discriminate dementia with Lewy bodies from Alzheimer disease. J Neurol 267, 1960–1969 (2020). https://doi.org/10.1007/s00415-020-09790-8
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DOI: https://doi.org/10.1007/s00415-020-09790-8