Cortical metabolic arrangement during olfactory processing: proposal for a 18F FDG PET/CT methodological approach

Area of Science:

• Neuroscience
• Medical Imaging

Background:

• Olfactory processing involves complex cortical networks.
• Understanding these networks is crucial for diagnosing olfactory disorders.

Purpose of the Study:

• To investigate cortical metabolic arrangements during olfactory processing.
• To map brain glucose consumption using F-fluorodeoxyglucose (FDG) PET/CT.

Main Methods:

• Twenty-six healthy adults underwent FDG PET/CT scans under neutral and olfactory conditions.
• Statistical parametric mapping (SPM2) analyzed differences between conditions.
• Data acquired in an ecological, resting state outside the scanner.

Main Results:

• Olfactory stimulation (OC) increased glucose metabolism in the cuneus, lingual, and parahippocampal gyri (left-dominant).
• Neutral condition (NC) showed higher metabolism in frontal and anterior cingulate cortex areas.
• Distinct metabolic patterns identified for olfactory perception versus resting state.

Conclusions:

• FDG PET/CT can identify specific cortical metabolic changes during olfactory processing.
• Findings provide a baseline for studying olfactory dysfunction.
• Ecological data acquisition minimizes confounding attentional effects.