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European Journal of Nuclear Medicine and Molecular Imaging

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01.12.2008 | Original Article

Principal component analysis of FDG PET in amnestic MCI

verfasst von: Flavio Nobili, Dario Salmaso, Silvia Morbelli, Nicola Girtler, Arnoldo Piccardo, Andrea Brugnolo, Barbara Dessi, Stig A. Larsson, Guido Rodriguez, Marco Pagani

Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging | Ausgabe 12/2008

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Abstract

Purpose

The purpose of the study is to evaluate the combined accuracy of episodic memory performance and ¹⁸F-FDG PET in identifying patients with amnestic mild cognitive impairment (aMCI) converting to Alzheimer’s disease (AD), aMCI non-converters, and controls.

Methods

Thirty-three patients with aMCI and 15 controls (CTR) were followed up for a mean of 21 months. Eleven patients developed AD (MCI/AD) and 22 remained with aMCI (MCI/MCI). ¹⁸F-FDG PET volumetric regions of interest underwent principal component analysis (PCA) that identified 12 principal components (PC), expressed by coarse component scores (CCS). Discriminant analysis was performed using the significant PCs and episodic memory scores.

Results

PCA highlighted relative hypometabolism in PC5, including bilateral posterior cingulate and left temporal pole, and in PC7, including the bilateral orbitofrontal cortex, both in MCI/MCI and MCI/AD vs CTR. PC5 itself plus PC12, including the left lateral frontal cortex (LFC: BAs 44, 45, 46, 47), were significantly different between MCI/AD and MCI/MCI. By a three-group discriminant analysis, CTR were more accurately identified by PET-CCS + delayed recall score (100%), MCI/MCI by PET-CCS + either immediate or delayed recall scores (91%), while MCI/AD was identified by PET-CCS alone (82%). PET increased by 25% the correct allocations achieved by memory scores, while memory scores increased by 15% the correct allocations achieved by PET.

Conclusion

Combining memory performance and ¹⁸F-FDG PET yielded a higher accuracy than each single tool in identifying CTR and MCI/MCI. The PC containing bilateral posterior cingulate and left temporal pole was the hallmark of MCI/MCI patients, while the PC including the left LFC was the hallmark of conversion to AD.

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Titel: Principal component analysis of FDG PET in amnestic MCI
verfasst von: Flavio Nobili
Dario Salmaso
Silvia Morbelli
Nicola Girtler
Arnoldo Piccardo
Andrea Brugnolo
Barbara Dessi
Stig A. Larsson
Guido Rodriguez
Marco Pagani
Publikationsdatum: 01.12.2008
Verlag: Springer-Verlag
Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging / Ausgabe 12/2008
Print ISSN: 1619-7070
Elektronische ISSN: 1619-7089
DOI: https://doi.org/10.1007/s00259-008-0869-z

Springer Medizin

Abstract

Purpose

Methods

Results

Conclusion

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