Magnetic Resonance Imaging of Inner Ear and Internal Auditory Canal Structures in the Presence of a Cochlear Implant

Dewey, Rebecca Susan; Dineen, Robert A.; Clemence, Matthew; Menon, Nitin; Bowtell, Richard; Boyle, Patrick; Hartley, Douglas E H

Abstract

Objective
To determine whether the internal auditory canal (IAC) can be visualized using magnetic resonance imaging (MRI) in users of a cochlear implant (CI) model that can safely undergo MRI at 3 T.

Patients
Four normally hearing controls and three individuals unilaterally implanted with a HiRes Ultra 3D (Advanced Bionics LLC, California, USA).

Interventions
Participants underwent 3 T MRI using sequences appropriate for the postoperative surveillance of the IAC. Images in normally hearing individuals were acquired after placing a fully functional, unpowered, CI underneath a swimming cap at each of eight candidate scalp positions, four on each side of the head. Images were compared to a control condition without a CI present. and CI users were imaged with similar sequences.

Main Outcome Measures
In normally hearing controls, the likely impact of the artifact on detection of pathology for multiple neuroradiological locations as rated by two independent radiologists. In CI users, a qualitative assessment of the diagnostic usability of images.

Results
Visibility of the ipsilateral IAC and cochlea varied among the three CI users, with images from one participant deemed largely usable, while those from the other two participants exhibited less diagnostic certainty, likely due to differences in implant locations and cranial/neuroanatomical variations. Ratings of images in normally hearing participants showed that more middle-to-anterior CI locations were associated with reduced likelihood of overlooking gross abnormalities.

Conclusion
Through meticulous surgical placement, bilateral IAC visualization may be achievable for monitoring chronic health conditions such as tumor surveillance in high-risk patients, and as a safety monitoring outcome measure in clinical trials.

Citation

Dewey, R. S., Dineen, R. A., Clemence, M., Menon, N., Bowtell, R., Boyle, P., & Hartley, D. E. H. (2025). Magnetic Resonance Imaging of Inner Ear and Internal Auditory Canal Structures in the Presence of a Cochlear Implant. Otology and Neurotology, 46(4), e105-e108. https://doi.org/10.1097/mao.0000000000004445

• Journal Article Type: Article
• Acceptance Date: Dec 30, 2024
• Online Publication Date: Feb 19, 2025
• Publication Date: 2025-04
• Deposit Date: Jan 6, 2025
• Publicly Available Date: Feb 20, 2026
• Journal: Otology and Neurotology
• Print ISSN: 1531-7129
• Electronic ISSN: 1537-4505
• Publisher: Lippincott, Williams & Wilkins
• Peer Reviewed: Peer Reviewed
• Volume: 46
• Issue: 4
• Pages: e105-e108
• DOI: https://doi.org/10.1097/mao.0000000000004445
• Keywords: magnetic resonance imaging; image artefact; Cochlear implant; post-operative surveillance
• Public URL: https://nottingham-repository.worktribe.com/output/43948493
• Publisher URL: https://journals.lww.com/otology-neurotology/fulltext/9900/magnetic_resonance_imaging_of_inner_ear_and.738.aspx