A post-processing protocol for three-dimensional visualization of the inner ear using the volume-rendering technique...

Area of Science:

• Radiology
• Medical Imaging
• Otolaryngology

Background:

• Three-dimensional (3D) imaging of the inner ear is crucial for diagnosing hearing loss.
• Volume rendering (VR) has shown promise for superior diagnostic quality compared to other post-processing (PP) techniques.
• Standardized protocols are needed for routine clinical application of VR in inner ear imaging.

Purpose of the Study:

• To define and assess a volume rendering (VR) protocol for routine 3D inner ear imaging.
• To evaluate the diagnostic quality and feasibility of the VR protocol in patients with hearing loss.

Main Methods:

• A VR protocol was defined using specific parameters (lower threshold values, surface shading, perspective views).
• Standardized 3D inner ear views were generated for 32 patients with sensorineural or combined hearing loss.
• Image quality was evaluated, and necessary protocol modifications were recorded.

Main Results:

• Comprehensive inner ear visualization was achieved in 28 out of 32 patients using two 3D shaded-surface views.
• Non-diagnostic image quality occurred in 4 patients due to data acquisition issues, artefacts, or mastoid cells.
• Protocol modifications improved diagnostic quality in 5 patients, with a mean post-processing time of 5.8 minutes per site.

Conclusions:

• The defined VR protocol is suitable for routine 3D inner ear assessment.
• Direct VR, predefined PP protocols, and standardized views are key for successful implementation.
• VR offers a valuable tool for evaluating the inner ear in patients with hearing loss.