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Updated: Jun 17, 2026

A Free-breathing fMRI Method to Study Human Olfactory Function
Published on: July 30, 2017
[Olfactory dysfunction: correlation of olfactory bulb volume on MRI and objective olfactometry]
H-C Bauknecht1, C Jach, F Fleiner
1Institut für Radiologie, Universitätsmedizin Berlin. christian.bauknecht@gmx.de
Magnetic resonance imaging (MRI) accurately measures olfactory bulb volume to detect smell loss. This MRI method shows high sensitivity and specificity for diagnosing olfactory dysfunction, including anosmia and hyposmia.
Area of Science:
- Neurology
- Radiology
- Ophthalmology
Background:
- Olfactory dysfunction significantly impacts quality of life.
- Objective olfactometry is the standard for assessing smell function.
- Non-invasive imaging biomarkers for olfactory dysfunction are needed.
Purpose of the Study:
- To evaluate the diagnostic role of olfactory bulb volume measurement using MRI.
- To compare MRI-derived olfactory bulb volumes with objective olfactometry results.
- To determine the predictive value of olfactory bulb volume for olfactory dysfunction.
Main Methods:
- Thirty patients with suspected olfactory dysfunction underwent MRI and objective olfactometry.
- Olfactory bulb volumes were measured from 3D MR datasets by two neuroradiologists.
- Pearson correlation and ROC analysis were used to assess the relationship between bulb volume and olfactory function.
Main Results:
- Olfactory bulb volumes ranged from 0 to 135.9 mm³.
- A strong correlation (r > 0.9) was observed between olfactory bulb volume and olfactometry.
- ROC analysis identified cut-off values for anosmia (32 mm³) and olfactory dysfunction (80.7 mm³) with high sensitivity and specificity.
Conclusions:
- Olfactory bulb volume measured by MRI is a reliable parameter for diagnosing olfactory dysfunction.
- MRI-based olfactory bulb volumetry offers a sensitive and specific method for detecting smell loss.
- This imaging technique can aid in the diagnosis of conditions causing anosmia and hyposmia.
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