Comparison of Cone Beam Irradiation Versus Multi-detector Scanner for Ear Imaging

Inclusion Criteria: * Adult or child patients of any gender and any age, including the pediatric population, receiving a CT scan of the petrous bone performed at Besançon University Hospital and prescribed in the Besançon University Hospital ENT department, or receiving a CBCT as part of an intraoperative check of cochlear implant position. * Women menopausal for at least 24 months, surgically sterilized, or, for women of childbearing age, using an effective contraceptive method (oral contraceptives, contraceptive injections, intra-uterine devices, double-barrier method, contraceptive patches). * Subject's non-opposition to study participation * Affiliation with a French social security scheme or beneficiary of such a scheme. Exclusion criteria are : * Legal incapacity or limited legal capacity * Subject unlikely to cooperate with the study and/or poor cooperation anticipated by the investigator.