MRI-based volumetric measurement of the substantia innominata in amnestic MCI and mild AD

Document Type

Article

Abstract

The substantia innominata (SI) contains the nucleus basalis of Meynert, which provides the major cholinergic innervation to the entire cortical mantel and the amygdala; degeneration of nucleus basalis neurons correlates with cognitive decline in Alzheimer's disease (AD). However, whether SI atrophy occurs in individuals with amnestic mild cognitive impairment (aMCI) has not been examined thoroughly in vivo. In the present study, we developed a new protocol to measure volumetric changes in the SI from magnetic resonance imaging (MRI) scans. Participants consisted of 27 elderly controls with no cognitive impairment (NCI); 33 individuals with aMCI; and 19 patients with mild AD. SI volumes were traced on three consecutive gapless 1. mm thick coronal slices. Results showed that SI volume was significantly reduced in the mild AD group compared to both NCI and aMCI participants; however, the NCI and aMCI groups did not differ from each other. Furthermore, a decrease in SI volume was related to impaired performance on declarative memory tasks even when attention was controlled. © 2009 Elsevier Inc.

Keywords

Aging, Basal forebrain, Cholinergic, Dementia, Imaging, Memory

Publication Date

10-1-2011

Publication Title

Neurobiology of Aging

ISSN

01974580

E-ISSN

15581497

Volume

32

Issue

10

First Page

1756

Last Page

1764

PubMed ID

20005600

Digital Object Identifier (DOI)

10.1016/j.neurobiolaging.2009.11.006

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