Comparison of Cochlear Implant Magnets and Their MRI Artifact Size.

Autor: Todt I; Department of Otolaryngology, Head and Neck Surgery, Bielefeld University, Campus Mitte, Bielefeld, Germany., Guerkov R; Department of Otolaryngology, Head and Neck Surgery, Bielefeld University, Campus Mitte, Bielefeld, Germany., Gehl HB; Department of Radiology, Klinikum Bielefeld, Bielefeld, Germany., Sudhoff H; Department of Otolaryngology, Head and Neck Surgery, Bielefeld University, Campus Mitte, Bielefeld, Germany.
Jazyk: angličtina
Zdroj: BioMed research international [Biomed Res Int] 2020 Jan 10; Vol. 2020, pp. 5086291. Date of Electronic Publication: 2020 Jan 10 (Print Publication: 2020).
DOI: 10.1155/2020/5086291
Abstrakt: Introduction: Recent developments regarding cochlear implant magnets (e.g., a bipolar diametral magnet) and refined surgical techniques (e.g., implant positioning) have had a significant impact on the relation between cochlear implants and MRIs, making the reproducible visibility of cochlea and IAC possible. MRI scanning has changed from a contraindication to a diagnostic tool. Magnet artifact size plays a central role in the visual assessment of the cochlea and IAC.
Objective: The aim of this study is to compare the CI magnet-related maximum artifact sizes of various cochlea implant systems.
Materials and Methods: We performed an in vivo measurement of MRI artifacts at 1.5 and 3 Tesla with three cochlear implant magnet systems (AB 3D, Medel Synchrony, and Oticon ZTI). The implant, including the magnet, was positioned with a head bandage 7.0 cm and 120° from the nasion, external auditory canal. We used a TSE T2w MRI sequence on the axial and coronal plains and compared the artifacts in two volunteers for each tesla strength.
Results: Intraindividual artifact size differences between the three magnets are smaller than interindividual maximum artifact size differences. 3 T MRI scans, in comparison to 1.5 T MRI scans, show a difference between soft artifact areas.
Conclusion: We observed no major difference between maximum implant magnet artifact sizes of the three implant magnet types.
Competing Interests: The authors declare that they have no conflicts of interest.
(Copyright © 2020 I. Todt et al.)
Databáze: MEDLINE
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