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Published on: October 13, 2016
[Mild cognitive impairment: imaging data]
1Unité de Neurologie Comportementale et Dégénérative, Neurologie B, CHU Gui-de-Chauliac, 34295 Montpellier Cedex 05 INSERM E 99-30, CHU de Montpellier.
Abstract:
The diagnosis of Mild Cognitive Impairment (MCI) as defined by Petersen et al. (1997), is based uniquely on clinical observations. Cerebral imaging, both morphological and functional, may in fact facilitate diagnosis, particularly with regard to the differentiation of sub-types of MCI and the identification of prodromal AD (MCI-AD). Volumetric Magnetic Resonance Imagery (MRI) examination of structures affected early in AD such as entorhinal cortex, the temporal lobe and, above all, the hippocampus, are especially useful. Hypoactivity within these regions, especially of the temporal lobe and posterior cingulate gyrus by Positon Emission Tomography, and more recently monophotonic emission tomoscintigraphy, also appears to have diagnostic utility. Studies of cholinergic system activity by functional imaging may also be of future value in MCI-AD diagnosis. MRI used in conjunction with other techniques may be of significant value, in particular the use of spectro-MRI and functional MRI. This latter technique, leading to the development of cognitive activation paradigms, is particularly promising.
Insights
Diagnosing Mild Cognitive Impairment (MCI) can be improved with advanced brain imaging techniques. These methods help differentiate MCI subtypes and identify early Alzheimer's disease (AD) signs.
Area of Science:
- Neurology
- Radiology
- Neuroscience
Background:
- Mild Cognitive Impairment (MCI) diagnosis currently relies solely on clinical observations.
- Identifying subtypes of MCI and prodromal Alzheimer's Disease (AD) remains a challenge.
Purpose of the Study:
- To explore the diagnostic utility of cerebral imaging in Mild Cognitive Impairment.
- To assess the potential of various imaging modalities for differentiating MCI subtypes and detecting prodromal AD.
Main Methods:
- Volumetric Magnetic Resonance Imagery (MRI) to examine brain structures like the hippocampus and entorhinal cortex.
- Functional imaging techniques including Positron Emission Tomography (PET) and single-photon emission computed tomography (SPECT) to assess regional brain activity.
- Investigating the role of functional MRI (fMRI) with cognitive activation paradigms.
Main Results:
- Volumetric MRI is valuable for assessing structures vulnerable to early AD pathology.
- Hypoactivity in specific brain regions (temporal lobe, posterior cingulate gyrus) detected by PET and SPECT shows diagnostic potential.
- Functional imaging of the cholinergic system may offer future diagnostic value for MCI-AD.
Conclusions:
- Cerebral imaging, particularly MRI, significantly aids MCI diagnosis and subtyping.
- Functional MRI combined with cognitive activation paradigms shows considerable promise for future diagnostic applications in MCI-AD.
