Artifact Reduction 3.0 T MRI in Cochlear Implantation Recipient With Diametrically Bipolar Magnets.

Abstract

This study aims to explore the clinical results of the MAVRIC-SL sequence in 3.0 Tesla (T) magnetic resonance imaging (MRI) examination of cochlear implant recipients with diametrically bipolar magnets. Retrospective study. Six consecutive patients implanted with diametrically bipolar magnets received a 3.0 T MRI for necessary reexaminations. The artifact volumes (cm³) and maximum artifact areas (cm²) were measured before and after applying the MAVRIC-SL. Adverse events, including discomfort or pain (measured using VAS), skin temperatures, and magnet displacement, were also recorded. All enrolled patients completed the MRI scans. Significant reductions in artifact volumes and maximum areas were observed with the MAVRIC-SL sequence compared to others (p < 0.05 to < 0.01). Targeted disease regions, as well as the inner ear anatomy, were clearly revealed with MAVRIC-SL. One patient (aged 12) reported pain (VAS score: 8) during the scan, while others (aged 10-36) did not experience discomfort. Neither displacement nor tilt of the internal magnet was seen. The MAVRIC-SL sequence represents a feasible and safe solution for 3 T MRI in cochlear implanters with diametrically bipolar magnets, providing a new option to meet clinical needs.