Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Schröder, Dirk, Grupe, Gloria, Rademacher, Grit, Mutze, Sven, Ernst, Arneborg, Seidl, Rainer, Mittmann, Philipp
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi 2018
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
_version_ 1783372872644820992
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
work_keys_str_mv AT schroderdirk magneticresonanceimagingartifactsandcochlearimplantpositioningat15tinvivo
AT grupegloria magneticresonanceimagingartifactsandcochlearimplantpositioningat15tinvivo
AT rademachergrit magneticresonanceimagingartifactsandcochlearimplantpositioningat15tinvivo
AT mutzesven magneticresonanceimagingartifactsandcochlearimplantpositioningat15tinvivo
AT ernstarneborg magneticresonanceimagingartifactsandcochlearimplantpositioningat15tinvivo
AT seidlrainer magneticresonanceimagingartifactsandcochlearimplantpositioningat15tinvivo
AT mittmannphilipp magneticresonanceimagingartifactsandcochlearimplantpositioningat15tinvivo