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Magnetic Resonance Imaging Artifacts and Cochlear Implant Positioning at 1.5 T In Vivo
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 i...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Hindawi
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6250014/ https://www.ncbi.nlm.nih.gov/pubmed/30533442 http://dx.doi.org/10.1155/2018/9163285 |
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author | Schröder, Dirk Grupe, Gloria Rademacher, Grit Mutze, Sven Ernst, Arneborg Seidl, Rainer Mittmann, Philipp |
author_facet | Schröder, Dirk Grupe, Gloria Rademacher, Grit Mutze, Sven Ernst, Arneborg Seidl, Rainer Mittmann, Philipp |
author_sort | Schröder, Dirk |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-6250014 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Hindawi |
record_format | MEDLINE/PubMed |
spelling | pubmed-62500142018-12-09 Magnetic Resonance Imaging Artifacts and Cochlear Implant Positioning at 1.5 T In Vivo Schröder, Dirk Grupe, Gloria Rademacher, Grit Mutze, Sven Ernst, Arneborg Seidl, Rainer Mittmann, Philipp Biomed Res Int Research Article 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. Hindawi 2018-11-08 /pmc/articles/PMC6250014/ /pubmed/30533442 http://dx.doi.org/10.1155/2018/9163285 Text en Copyright © 2018 Dirk Schröder et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Schröder, Dirk Grupe, Gloria Rademacher, Grit Mutze, Sven Ernst, Arneborg Seidl, Rainer Mittmann, Philipp Magnetic Resonance Imaging Artifacts and Cochlear Implant Positioning at 1.5 T In Vivo |
title | Magnetic Resonance Imaging Artifacts and Cochlear Implant Positioning at 1.5 T In Vivo |
title_full | Magnetic Resonance Imaging Artifacts and Cochlear Implant Positioning at 1.5 T In Vivo |
title_fullStr | Magnetic Resonance Imaging Artifacts and Cochlear Implant Positioning at 1.5 T In Vivo |
title_full_unstemmed | Magnetic Resonance Imaging Artifacts and Cochlear Implant Positioning at 1.5 T In Vivo |
title_short | Magnetic Resonance Imaging Artifacts and Cochlear Implant Positioning at 1.5 T In Vivo |
title_sort | magnetic resonance imaging artifacts and cochlear implant positioning at 1.5 t in vivo |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6250014/ https://www.ncbi.nlm.nih.gov/pubmed/30533442 http://dx.doi.org/10.1155/2018/9163285 |
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