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Automatic Localization of Cochlear Implant Electrode Contacts in CT
Edwin Bennink1, Jeroen P M Peters, Anne W Wendrich
11Image Sciences Institute, University Medical Center Utrecht, Utrecht, The Netherlands; 2Department of Otorhinolaryngology and Head & Neck Surgery, University Medical Center Utrecht, Utrecht, The Netherlands; 3Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, The Netherlands; and 4Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands.
Ear and Hearing
|April 6, 2017
Summary
A new automatic method accurately locates cochlear implant (CI) electrode contacts in CT scans using prior implant geometry. This approach improves understanding of CI positioning and hearing outcomes.
Area of Science:
- Otolaryngology
- Biomedical Engineering
- Medical Imaging
Background:
- Accurate cochlear implant (CI) electrode contact localization is crucial for correlating CI positioning with hearing outcomes.
- High-resolution clinical computed tomography (CT) scanners face limitations in resolving closely spaced electrode contacts.
- Existing methods struggle with precise localization due to the near-limit spatial resolution of CT scans.
Purpose of the Study:
- To introduce and evaluate a simple, automatic method for localizing intracochlear electrode contacts.
- To leverage CI geometric specifications as prior knowledge for accurate contact position estimation.
- To overcome the challenges of resolving individual contacts in high-resolution CT scans.
Main Methods:
- Utilized prior knowledge of CI geometry to estimate intracochlear electrode contact positions in CT scans from seven adult patients.
- Employed an automatic detection method and verified results against manual markings by two experienced observers.
- Calculated interobserver errors and compared automatic versus manual detection errors.
- Transformed contact positions to a cylindrical cochlear coordinate system to measure insertion angles and radii.
Main Results:
- Demonstrated a high linear correlation between automatically detected and manually detected contact positions (R = 0.98 for radius, R = 1.00 for insertion angle).
- Achieved errors in radius (0.12 mm) and insertion angle (1.7°) comparable to interobserver variability.
- Measurements of cochlear geometry aligned with typical human cochlear dimensions.
Conclusions:
- Automatic analysis of high-resolution CT scans, utilizing implant geometry as prior knowledge, enables accurate localization of CI electrode contacts.
- The developed method provides precise data for detailed investigation into the relationship between CI positioning and hearing outcomes.