Cone-Beam CT of the Temporal Bone: Normative Linear Biometry of Inner Ear Structures

Area of Science:

• Radiology and Imaging
• Otolaryngology
• Anatomy

Background:

• Accurate diagnosis of congenital inner ear abnormalities is crucial.
• Normative linear measurements of temporal bone anatomy can improve diagnostic precision.
• Cone-Beam Computed Tomography (CBCT) offers detailed imaging of inner ear structures.

Purpose of the Study:

• To establish normative linear reference values for temporal bone anatomy using CBCT.
• To provide a dataset for enhanced detection of subtle congenital abnormalities.

Main Methods:

• Retrospective review of 319 normal temporal bone CBCT scans (June 2022 - June 2024).
• Eleven key linear measurements of inner ear structures performed by two radiologists.
• Assessment of interobserver agreement and generation of normative centile distributions.

Main Results:

• High interobserver reliability achieved for all measurements.
• Age and sex demonstrated minimal impact on the measured parameters.
• Comprehensive normative centile distributions for eleven inner ear structures were successfully established.

Conclusions:

• This study successfully generated robust CBCT-derived normative linear measurements for inner ear structures.
• These reference values are expected to enhance radiologic assessment of congenital hearing loss.
• The findings are particularly valuable for evaluating patients with seemingly normal CT examinations.