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Related Experiment Video

Updated: Aug 24, 2025

A Free-breathing fMRI Method to Study Human Olfactory Function
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Functional Imaging in Olfactory Disorders.

V Van Regemorter1,2, Ph Rombaux1,3, L Dricot1

  • 1Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium.

Current Otorhinolaryngology Reports
|October 24, 2022
PubMed
Summary
This summary is machine-generated.

Functional MRI (fMRI) shows promise for diagnosing olfactory dysfunction (OD) by revealing altered brain activity. However, variability currently limits its routine clinical application for OD assessment.

Keywords:
Brain networkFunctional MRINeuroimagingOlfactory dysfunctionOlfactory trainingParosmia

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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.