Traumatic ossicular chain separation: sliding-thin-slab maximum-intensity projections for diagnosis

Area of Science:

• Radiology
• Medical Imaging
• Otolaryngology

Background:

• Traumatic ossicular chain separation is a common cause of hearing loss.
• Conventional multiplanar reformation (MPR) CT images can be limited in diagnosing this condition.
• Advanced imaging techniques may offer improved diagnostic capabilities.

Purpose of the Study:

• To evaluate if adding maximum-intensity projection (MIP) reformation images to conventional MPR CT scans improves diagnostic accuracy for traumatic ossicular chain separation.
• To compare the diagnostic performance of MPR images alone versus MPR with MIP images.

Main Methods:

• Retrospective analysis of 29 patients with confirmed traumatic ossicular chain separation and 29 controls who underwent temporal bone multislice computed tomography (MSCT).
• Two neuroradiologists independently reviewed MPR images only, and then MPR with MIP images, blinded to clinical history.
• Statistical analysis using chi-squared test for diagnostic accuracy and Cohen kappa for interobserver variability.

Main Results:

• Diagnostic accuracy for traumatic ossicular chain separation was significantly higher when MIP images were included with MPR (Observer 1: 24.1%, Observer 2: 23.3%) compared to MPR alone (Observer 1: 16.4%, Observer 2: 17.2%).
• High interobserver agreement was observed for both imaging methods (kappa values 0.89 for MPR, 0.96 for MPR with MIP).

Conclusions:

• The additional interpretation of MIP reformation images significantly enhances diagnostic accuracy for traumatic ossicular chain separation.
• Combining MIP with MPR CT imaging is a valuable tool for diagnosing ossicular chain injuries.