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Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
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Cochlear Implant: Analysis of the Frequency-to-Place Mismatch with the Table-Based Software OTOPLAN® and Its
Laura Dessard1, Guillaume Gersdorff1, Nicola Ivanovik2
1Department of Otorhinolaryngology, CHU, Liège, Belgium.
Audiology & Neuro-Otology
|January 8, 2024
Summary
Cochlear implant frequency mapping mismatch impacts hearing. Larger discrepancies between default and anatomy-based maps correlate with poorer speech understanding and slower adaptation for patients.
Area of Science:
- Audiology
- Biomedical Engineering
- Neurosurgery
Background:
- Cochlear implant activation involves default frequency mapping.
- Anatomy-based mapping software (OTOPLAN®) offers precise electrode-frequency correlation.
- Individual cochlear anatomy varies, potentially creating discrepancies.
Purpose of the Study:
- To compare default cochlear implant frequency maps with anatomy-based maps generated by OTOPLAN®.
- To assess the impact of mismatches between these maps on speech intelligibility.
- To investigate the relationship between frequency map discrepancies and auditory performance.
Main Methods:
- Retrospective study of cochlear implant patients (2016-2021).
- OTOPLAN® used to calculate anatomical tonotopic frequency allocation per electrode.
- Comparison of anatomical mapping with default mapping and Auditory Capacity Index (ACI).
Main Results:
- All 13 patients exhibited a mismatch between default and anatomical frequency maps (200-1,100 Hz).
- Greater frequency shift showed a significant inverse correlation with ACI.
- Increased mismatch correlated with longer times for speech intelligibility improvement.
Conclusions:
- Significant mismatch between default and anatomy-based cochlear implant frequency maps is common.
- Larger mismatches are linked to poorer hearing outcomes and slower patient adaptation.
- Anatomy-based frequency mapping may optimize cochlear implant performance.
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