Magnetic resonance imaging investigation of the bone conduction implant – a pilot study at 1.5 Tesla

Magnetic resonance imaging investigation of the bone conduction implant – a pilot study at 1.5 Tesla

Karl-Johan Fredén Jansson,1 Bo Håkansson,1 Sabine Reinfeldt,1 Cristina Rigato,1 Måns Eeg-Olofsson2 1Department of Signals and Systems, Chalmers University of Technology, 2Deptartment of Otorhinolaryngology Head and Neck Surgery, Sahlgrenska University Hospital, The Sah...

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Autores principales: Fredén Jansson KJ, Håkansson B, Reinfeldt S, Rigato C, Eeg-Olofsson M
Formato: article
Lenguaje:EN
Publicado: Dove Medical Press 2015
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Medical technology
R855-855.5
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spelling oai:doaj.org-article:96fa3f1edcb54f4c9fd862db40c3d6bf2021-12-02T01:47:42ZMagnetic resonance imaging investigation of the bone conduction implant – a pilot study at 1.5 Tesla1179-1470https://doaj.org/article/96fa3f1edcb54f4c9fd862db40c3d6bf2015-10-01T00:00:00Zhttps://www.dovepress.com/magnetic-resonance-imaging-investigation-of-the-bone-conduction-implan-peer-reviewed-article-MDERhttps://doaj.org/toc/1179-1470Karl-Johan Fredén Jansson,1 Bo Håkansson,1 Sabine Reinfeldt,1 Cristina Rigato,1 Måns Eeg-Olofsson2 1Department of Signals and Systems, Chalmers University of Technology, 2Deptartment of Otorhinolaryngology Head and Neck Surgery, Sahlgrenska University Hospital, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden Purpose: The objective of this pilot study was to investigate if an active bone conduction implant (BCI) used in an ongoing clinical study withstands magnetic resonance imaging (MRI) of 1.5 Tesla. In particular, the MRI effects on maximum power output (MPO), total harmonic distortion (THD), and demagnetization were investigated. Implant activation and image artifacts were also evaluated.Methods and materials: One implant was placed on the head of a test person at the position corresponding to the normal position of an implanted BCI and applied with a static pressure using a bandage and scanned in a 1.5 Tesla MRI camera. Scanning was performed both with and without the implant, in three orthogonal planes, and for one spin-echo and one gradient-echo pulse sequence. Implant functionality was verified in-between the scans using an audio processor programmed to generate a sequence of tones when attached to the implant. Objective verification was also carried out by measuring MPO and THD on a skull simulator as well as retention force, before and after MRI.Results: It was found that the exposure of 1.5 Tesla MRI only had a minor effect on the MPO, ie, it decreased over all frequencies with an average of 1.1±2.1 dB. The THD remained unchanged above 300 Hz and was increased only at lower frequencies. The retention magnet was demagnetized by 5%. The maximum image artifacts reached a distance of 9 and 10 cm from the implant in the coronal plane for the spin-echo and the gradient-echo sequence, respectively. The test person reported no MRI induced sound from the implant.Conclusion: This pilot study indicates that the present BCI may withstand 1.5 Tesla MRI with only minor effects on its performance. No MRI induced sound was reported, but the head image was highly distorted near the implant.Keywords: bone conduction implant (BCI), magnetic resonance imaging (MRI), image artifacts, demagnetization, magnetic torqueFredén Jansson KJHåkansson BReinfeldt SRigato CEeg-Olofsson MDove Medical PressarticleMedical technologyR855-855.5ENMedical Devices: Evidence and Research, Vol 2015, Iss default, Pp 413-423 (2015)
institution DOAJ
collection DOAJ
language EN
topic Medical technology
R855-855.5
spellingShingle Medical technology
R855-855.5
Fredén Jansson KJ
Håkansson B
Reinfeldt S
Rigato C
Eeg-Olofsson M
Magnetic resonance imaging investigation of the bone conduction implant – a pilot study at 1.5 Tesla
description Karl-Johan Fredén Jansson,1 Bo Håkansson,1 Sabine Reinfeldt,1 Cristina Rigato,1 Måns Eeg-Olofsson2 1Department of Signals and Systems, Chalmers University of Technology, 2Deptartment of Otorhinolaryngology Head and Neck Surgery, Sahlgrenska University Hospital, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden Purpose: The objective of this pilot study was to investigate if an active bone conduction implant (BCI) used in an ongoing clinical study withstands magnetic resonance imaging (MRI) of 1.5 Tesla. In particular, the MRI effects on maximum power output (MPO), total harmonic distortion (THD), and demagnetization were investigated. Implant activation and image artifacts were also evaluated.Methods and materials: One implant was placed on the head of a test person at the position corresponding to the normal position of an implanted BCI and applied with a static pressure using a bandage and scanned in a 1.5 Tesla MRI camera. Scanning was performed both with and without the implant, in three orthogonal planes, and for one spin-echo and one gradient-echo pulse sequence. Implant functionality was verified in-between the scans using an audio processor programmed to generate a sequence of tones when attached to the implant. Objective verification was also carried out by measuring MPO and THD on a skull simulator as well as retention force, before and after MRI.Results: It was found that the exposure of 1.5 Tesla MRI only had a minor effect on the MPO, ie, it decreased over all frequencies with an average of 1.1±2.1 dB. The THD remained unchanged above 300 Hz and was increased only at lower frequencies. The retention magnet was demagnetized by 5%. The maximum image artifacts reached a distance of 9 and 10 cm from the implant in the coronal plane for the spin-echo and the gradient-echo sequence, respectively. The test person reported no MRI induced sound from the implant.Conclusion: This pilot study indicates that the present BCI may withstand 1.5 Tesla MRI with only minor effects on its performance. No MRI induced sound was reported, but the head image was highly distorted near the implant.Keywords: bone conduction implant (BCI), magnetic resonance imaging (MRI), image artifacts, demagnetization, magnetic torque
format article
author Fredén Jansson KJ
Håkansson B
Reinfeldt S
Rigato C
Eeg-Olofsson M
author_facet Fredén Jansson KJ
Håkansson B
Reinfeldt S
Rigato C
Eeg-Olofsson M
author_sort Fredén Jansson KJ
title Magnetic resonance imaging investigation of the bone conduction implant – a pilot study at 1.5 Tesla
title_short Magnetic resonance imaging investigation of the bone conduction implant – a pilot study at 1.5 Tesla
title_full Magnetic resonance imaging investigation of the bone conduction implant – a pilot study at 1.5 Tesla
title_fullStr Magnetic resonance imaging investigation of the bone conduction implant – a pilot study at 1.5 Tesla
title_full_unstemmed Magnetic resonance imaging investigation of the bone conduction implant – a pilot study at 1.5 Tesla
title_sort magnetic resonance imaging investigation of the bone conduction implant – a pilot study at 1.5 tesla
publisher Dove Medical Press
publishDate 2015
url https://doaj.org/article/96fa3f1edcb54f4c9fd862db40c3d6bf
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AT reinfeldts magneticresonanceimaginginvestigationoftheboneconductionimplantndashapilotstudyat15tesla
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