MRI-induced artifact by a cochlear implant with a novel magnet system: an experimental cadaver study
| Autor: | Pietro Canzi, Marco Benazzo, Federico Aprile, Simone Terrani, Andrea Scribante, Elvis Lafe, Irene Avato, Marco Manfrin, Domenico Minervini, Anna Simoncelli, Marianna Magnetto, Dzemal Gazibegovic |
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| Rok vydání: | 2020 |
| Předmět: |
Image quality
medicine.medical_treatment Otology 03 medical and health sciences 0302 clinical medicine Magnetic resonance imaging Cadaver Cochlear implant Medicine Humans 030223 otorhinolaryngology Cochlear implantation Artifact (error) medicine.diagnostic_test business.industry General Medicine Cochlear Implantation Cochlear Implants Otorhinolaryngology Ultra 3D Magnets Implant Cadaveric spasm business Artifacts 030217 neurology & neurosurgery Biomedical engineering |
| Zdroj: | European Archives of Oto-Rhino-Laryngology |
| ISSN: | 1434-4726 |
| Popis: | Purposes To primarily evaluate MRI-induced effects for Ultra 3D cochlear implantation in human cadavers in terms of artifact generation and MR image quality. Methods Three human cadaveric heads were submitted to imaging after unilateral and bilateral cochlear implantation. The 1.5 T MR examination protocol was chosen in accordance with our institutional protocol for the assessment of brain pathology. The maximal signal void size was measured according to each sequence and plane. Two experienced neuro-radiologists and one experienced otoneurosurgeon independently evaluated the MR image quality findings. A 4-point scale was used to describe the diagnostic usefulness of 14 brain structures. Results Shape and size of the artifacts were found to be highly related to MRI sequences and acquisition planes. MRI sequences and processing algorithms affected the ability to assess anatomical visibility. Image quality appeared either high or assessable for diagnostic purposes in 9 out of 14 of the ipsilateral structures, in at least one plane. Anatomical structures contralateral to the cochlear implant were highly visible in all conditions. Artifact intrusion clearly improved after application of metal artifact-reduction techniques. In the case of bilateral cochlear implant, a mutual interaction between the two implant magnets produced an additional artifact. Conclusions We performed the first cadaver study aimed at systematically evaluating the MRI-induced artifacts produced by a cochlear implant with a novel four bar magnet system. Specific brain structures can be assessable for diagnostic purposes under 1.5 T MRI, with the cochlear implant magnet in place. |
| Databáze: | OpenAIRE |
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