Irina Mader1, Markus Treier1, Christian Schild2, Hansjrg Mast1, Stefan Zwick3, Christian Taschner1, Susan Arndt2
1Neuroradiology, University Medical Center Freiburg, Freiburg, Germany; 2Dept. of Otorhinolaryngology, University Medical Center Freiburg, Freiburg, Germany; 3Dept. of Radiology, Medical Physics, University Medical Center Freiburg, Freiburg, Germany
Problem: MR imaging in patients with cochlear implants (CI) has to be considered at 3T. Imaging artefacts are a major concern for the assessment of anatomical structures. Methods: Imaging artefacts of 5 different types of CI were evaluated at 1.5 and 3T in a phantom and a cadaver head at two different implantation angles and in 6 imaging sequences. Results: An automated cluster analysis showed that the main factor for artefacts was the presence of the magnet in the CI during scanning. Conclusion: Artefact sizes were in line to the literature. MR scanning without magnet in the CI is preferable.