Functional Imaging in Olfactory Disorders

Area of Science:

• Neuroscience
• Medical Imaging
• Otolaryngology

Background:

• Olfactory dysfunction (OD) significantly impacts quality of life.
• Current diagnostic methods for OD are often subjective.
• Objective biomarkers for OD are needed.

Purpose of the Study:

• To synthesize findings on functional MRI (fMRI) for assessing olfactory dysfunction (OD).
• To evaluate the potential of fMRI as a reliable clinical diagnostic tool for OD.

Main Methods:

• Review of studies utilizing fMRI to investigate brain responses to olfactory stimulation in individuals with OD.
• Analysis of functional connectivity alterations in patients with OD.
• Assessment of trigeminal chemosensory system processing via fMRI.

Main Results:

• Patients with quantitative OD show altered activation in olfactory and non-olfactory brain regions.
• Parosmic patients exhibit complex patterns of reduced and heightened brain signals.
• fMRI suggests potential decline in central trigeminal chemosensory processing in OD.
• Altered functional connectivity correlates with olfactory performance.

Conclusions:

• fMRI is a promising objective tool for evaluating OD.
• High inter-individual variability in fMRI results currently hinders routine clinical diagnostic use.
• Future research should optimize fMRI stimulation and analysis methods for OD.