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European Archives of Oto-Rhino-Laryngology

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01-12-2009 | Otology

Artifacts caused by cochlear implants with non-removable magnets in 3T MRI: phantom and cadaveric studies

Authors: Omid Majdani, Thomas S. Rau, Friedrich Götz, Martin Zimmerling, Minoo Lenarz, Thomas Lenarz, Robert Labadie, Martin Leinung

Published in: European Archives of Oto-Rhino-Laryngology | Issue 12/2009

Abstract

The aim of this study was to evaluate artifacts produced by cochlear implants (CI) during 3.0 Tesla (T) magnetic resonance imaging of the brain using different sequences on phantom and cadaveric specimens. A phantom and three cadaveric specimens with CIs were imaged using a 3.0 T clinical scanner. Artifacts were analyzed quantitatively and according to the sequence used. Different brain regions were evaluated for image distortion and limitation of diagnostic significance. In cadaver studies, all sequences generated signal-void areas around the implant. In T2-weighted sequences, additional periodic shadowing was discovered. Anatomical structures of the brain on the contralateral side of the CI were for the most part undistorted. At 3T, artifacts around CIs with non-removable magnets compromise image quality of the nearby brain regions and diagnosis of brain lesions is limited. In the contralateral hemisphere, diagnostic accuracy is only marginally limited.

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Title: Artifacts caused by cochlear implants with non-removable magnets in 3T MRI: phantom and cadaveric studies
Authors: Omid Majdani
Thomas S. Rau
Friedrich Götz
Martin Zimmerling
Minoo Lenarz
Thomas Lenarz
Robert Labadie
Martin Leinung
Publication date: 01-12-2009
Publisher: Springer-Verlag
Published in: European Archives of Oto-Rhino-Laryngology / Issue 12/2009
Print ISSN: 0937-4477
Electronic ISSN: 1434-4726
DOI: https://doi.org/10.1007/s00405-009-0994-8

At a glance: The STEP trials

Springer Medicine

Artifacts caused by cochlear implants with non-removable magnets in 3T MRI: phantom and cadaveric studies

Abstract

At a glance: The STEP trials

Springer Medicine

Abstract

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