Analysis and Reducing Modalities for Artefacts Generated by Bone Conduction Implants and Cochlear Implants Subjected to an MRI Magnetic Field

Little scientific data is available on the artifacts generated by hearing implants. Indeed, hearing rehabilitation for deaf people was given priority over the potential constraints of imaging. Investigator team find less than 10 articles with a search of following keywords on the pubmed database: Artifacts AND MRI AND cochlear implants. Only one of these articles deals with demagnetization. There is only one article dealing with artifacts with the Bonebridge implant. There are no studies with the Attract implant and a recent one with the new Synchrony mobile magnet implant, but by removing the magnet which implies a minimum response time and therefore not compatible with emergency care.

In total, the literature is quite poor mainly considering the priority of auditory rehabilitation on the realization of subsequent imaging.

However, the current "democratization" of hearing implants and their increasing use in children and adults requires reflection on not only the safety of examinations of healthy volunteers, but also of the implant itself. also on the relevance of the interpretation of imaging especially cerebral.

The pilot study done, suggested that the placement of the implant (in this case the Bonebridge) has an influence on the size of the artifact and the possibilities of interpretation.

It seems appropriate to continue this protocol of analysis, both on the implants in bone conduction, and also on the cochlear implants to demonstrate the impact of the implant on the MRI images and also the impact of the magnetic field on the implant itself, and possibly publish recommendations for clinical practice.

Inclusion criteria

• 18 years old or more
• free of otological, neurological or psychiatric pathology
• absence of contraindication to MRI *
• free and informed consent signed

Exclusion criteria

• minor subject, major guardianship or trusteeship and major protected under the law (pregnant women, nursing, parturiante, persons deprived of their liberty)
• suject carrier of an implantable device or para magnetic
• contraindication to MRI *
• revious otological pathology, tinnitus, deafness
• revious cerebral pathology
• unable to understand the objectives, issues and risks of the study and to give free and informed consent.

• Contraindications to MRI are:

Claustrophobia Anxiety attack Morphotype does not allow access to MRI

Wearing a metal implant, for example:

• a pacemaker
• ferromagnetic surgical clips
• foreign bodies