Radiologic evaluation of multichannel intracochlear implant insertion depth

Area of Science:

• Neurosurgery
• Radiology
• Audiology

Background:

• Postoperative imaging is vital for multichannel cochlear implants (CIs) to verify electrode position and detect complications.
• Accurate documentation of electrode insertion depth is essential for comparing speech recognition outcomes and developing future speech processing strategies.

Purpose of the Study:

• To devise and validate a modified Stenver's view for precise documentation of multichannel intracochlear electrode array insertion depths.
• To compare surgical estimates of insertion depth with radiographic findings and assess their correlation with speech discrimination.

Main Methods:

• A modified Stenver's view radiographic technique was employed.
• Insertion depths of electrode arrays were documented in 50 multichannel cochlear implant patients.
• Surgical estimates of insertion depth were compared with x-ray measurements.

Main Results:

• Surgical estimates of electrode insertion depth demonstrated significant variability compared to x-ray documentation.
• The modified Stenver's view provided more accurate documentation of electrode array insertion depths and individual electrode locations.
• Preliminary evidence suggests a strong correlation between radiographically determined insertion depth and open-set speech discrimination.

Conclusions:

• The modified Stenver's view is a valuable tool for accurately assessing multichannel cochlear implant electrode insertion depth.
• Radiographic assessment of insertion depth is superior to surgical estimates and shows a strong correlation with speech recognition outcomes.
• Precise imaging of electrode placement is critical for optimizing cochlear implant performance and patient outcomes.