Estimation of Normal Semi-circular Canal Dimensions on Computed Tomography

Area of Science:

• Anatomy
• Radiology
• Otology

Background:

• Vestibular dysfunction can significantly impact quality of life.
• Accurate anatomical measurements of the inner ear are crucial for diagnosing and understanding vestibular disorders.

Purpose of the Study:

• To measure and compare the length, width, and luminal diameters of the semi-circular canals (SCCs) using multiplanar reformatted CT images.
• To establish reference values for SCC dimensions in an Indian population without vestibular dysfunction.

Main Methods:

• A prospective, cross-sectional study involving 50 participants without vestibular dysfunction.
• Multiplanar reformatted CT scans of the temporal bone were analyzed.
• Measurements of curved lengths, widths, and luminal diameters of the three SCCs were taken and statistically compared.

Main Results:

• Superior SCC width (4.8 mm) was significantly larger than Posterior SCC (4.17 mm) and Lateral SCC (3.65 mm).
• No significant difference was found in mean mid-luminal diameters among the three SCCs.
• Mid-luminal diameters were smaller than diameters at the ends of all SCCs.

Conclusions:

• The study provides reference values for SCC dimensions in the Indian population.
• These findings can be valuable for further research into the pathophysiology of disequilibrium.