High-resolution cone-beam computed tomography: a potential tool to improve atraumatic electrode design and position

Area of Science:

• Otorhinolaryngology
• Medical Imaging
• Biomedical Engineering

Background:

• Cochlear implant (CI) insertion accuracy is crucial for hearing outcomes.
• Histopathological examination is the gold standard for assessing CI placement but is invasive.
• Novel imaging techniques are needed for non-invasive evaluation of CI trajectory.

Purpose of the Study:

• To evaluate the fidelity of cone-beam computed tomography (CBCT) and 3D visualization in characterizing CI insertion.
• To compare CBCT imaging with histopathological examination as the gold standard.

Main Methods:

• Eleven human temporal bones were implanted with the Straight Research Array (SRA).
• Post-insertion, intraoperative CBCT was performed using a mobile C-arm.
• High-resolution 3D volumes were generated and compared with light microscopic examination of sectioned bones.

Main Results:

• CBCT demonstrated adequate resolution to identify scala implantation, kinking, intracochlear contacts, and array ascension.
• CBCT confirmed overall ideal CI insertion.
• CBCT lacked resolution to detect electrode contact reversal or basilar membrane rupture.

Conclusions:

• Flat-panel CBCT is a viable non-invasive method for assessing CI array trajectory.
• CBCT provides data comparable to histopathology, with potential for clinical and research use.
• Further refinement may improve CBCT's ability to detect subtle insertion anomalies.