Magnetic Resonance Imaging Artifacts and Cochlear Implant Positioning at 1.5 T In Vivo
| Autor: | Arneborg Ernst, Rainer O. Seidl, Sven Mutze, Dirk Schröder, Grit Rademacher, G. Grupe, Philipp Mittmann |
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| Rok vydání: | 2018 |
| Předmět: |
Article Subject
medicine.medical_treatment lcsh:Medicine General Biochemistry Genetics and Molecular Biology 03 medical and health sciences 0302 clinical medicine Cochlear implant medicine Outer ear otorhinolaryngologic diseases Humans Ear canal 030223 otorhinolaryngology Cochlear implantation Artifact (error) General Immunology and Microbiology medicine.diagnostic_test business.industry lcsh:R Magnetic resonance imaging General Medicine Anatomy Magnetic Resonance Imaging medicine.anatomical_structure Cochlear Implants 030220 oncology & carcinogenesis Referral center sense organs business T2 weighted Artifacts Ear Canal Research Article |
| Zdroj: | BioMed Research International BioMed Research International, Vol 2018 (2018) |
| ISSN: | 2314-6141 |
| Popis: | Objective. Cerebral magnetic resonance imaging with the magnet of the cochlear implant receiver/stimulator in place causes artifacts and hinders evaluation of intracerebral structures. The aim of this study was to evaluate the internal auditory canal and the labyrinth in a 1.5T MRI with the magnet in place. Study Design. Observational study. Setting. Tertiary referral center. Subjects and Methods. The receiver/stimulator unit was placed and fixed onto the head of three volunteers at three different angles to the nasion–outer ear canal (90°–160°) and at three different distances from the outer ear canal (5–9 cm). T1 and T2 weighted sequences were conducted for each position. Results. Excellent visibility of the internal auditory canal and the labyrinth was seen in the T2 weighted sequences with 9 cm between the magnet and the outer ear canal at every nasion–outer ear canal angle. T1 sequences showed poorer visibility of the internal auditory canal and the labyrinth. Conclusion. Aftercare and visibility of intracerebral structures after cochlear implantation is becoming more important as cochlear implant indications are widened worldwide. With a distance of at least 9 cm from the outer ear canal the artifact induced by the magnet allows evaluation of the labyrinth and the internal auditory canal. |
| Databáze: | OpenAIRE |
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