How to measure olfactory bulb volume and olfactory sulcus depth?

Area of Science:

• Neurology
• Radiology
• Otolaryngology

Background:

• Olfactory dysfunction significantly impacts quality of life.
• Accurate diagnosis of smell disorders is crucial for effective management.
• Current diagnostic methods may require complementary imaging techniques.

Purpose of the Study:

• To outline the methodology for measuring olfactory bulb volume (OBV) and olfactory sulcus depth (OSD) using MRI.
• To demonstrate the utility of quantitative MRI in diagnosing various olfactory dysfunctions.
• To highlight the role of MRI in assessing olfactory system plasticity.

Main Methods:

• Utilizing magnetic resonance imaging (MRI) for quantitative volumetric measurements of the olfactory bulb (OB).
• Measuring olfactory sulcus depth (OSD) through standardized MRI protocols.
• Correlating MRI findings with psychophysical testing and electrophysiological data.
• Analyzing temporal changes in OB volume to infer olfactory system plasticity.

Main Results:

• Quantitative MRI measurements of OBV and OSD provide objective data for diagnosing olfactory dysfunction.
• MRI can identify structural abnormalities contributing to smell loss.
• Demonstrated changes in OB volume over time, reflecting olfactory system plasticity.
• Illustrative cases include congenital anosmia, post-infectious/traumatic loss, and sinonasal-related dysfunction.

Conclusions:

• MRI, particularly quantitative OBV and OSD measurements, is a valuable tool in the clinical evaluation of olfactory dysfunction.
• Radiological assessment synergistically contributes to accurate diagnosis alongside clinical and electrophysiological methods.
• MRI offers insights into the dynamic nature and plasticity of the human olfactory system.