Magnetic Resonance Imaging Compatibility of the Polymer-based Cochlear Implant.
- Author:
Jin Ho KIM
1
;
Kyou Sik MIN
;
Soon Kwan AN
;
Joon Soo JEONG
;
Sang Beom JUN
;
Min Hyoung CHO
;
Young Don SON
;
Zang Hee CHO
;
Sung June KIM
Author Information
1. School of Electrical Engineering and Computer Science, College of Engineering, Seoul National University, Seoul, Korea. kimsj@snu.ac.kr
- Publication Type:Original Article
- Keywords:
Cochlear implant;
Magnetic resonance imaging;
MRI compatibility
- MeSH:
Artifacts;
Auditory Perception;
Brain;
Chimera;
Cochlear Implantation;
Cochlear Implants;
Electrons;
Hand;
Head;
Liquid Crystals;
Magnetic Resonance Imaging;
Magnetic Resonance Spectroscopy;
Magnetics;
Magnets;
Polymers
- From:Clinical and Experimental Otorhinolaryngology
2012;5(Suppl 1):S19-S23
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVES: In this study, we compared the magnetic resonance (MR) image artifacts caused by a conventional metal-based cochlear implant and a newly developed liquid crystal polymer (LCP)-based device. METHODS: The metal-based cochlear implant system (Nurobiosys Co.) was attached to side of the head of a subject and the LCP-based device was attached to opposite side. In both devices, alignment magnets were removed for safety. Magnetic resonance imaging (MRI) was performed on a widely used 3.0 T and an ultra-high 7.0 T MRI machine. 3.0 and 7.0 T MR images were acquired using T1- and T2*-weighted gradient echo sequences, respectively. RESULTS: In the 3.0 T images, the metal-based device on the left side generated the significant amount of artifacts. The MR images in the proximity of the metal package were obscured by the artifacts in both axial and sagittal views. On the other hand, the MR images near the LCP-based device were relatively free from the artifacts and clearly showed the brain structures. 7.0 T MR images showed the more severe distortion in the both sides but the metal-based cochlear implant system caused a much larger obscure area than the LCP-based system. CONCLUSION: The novel LCP-based cochlear implant provides a good MRI compatibility beyond present-day cochlear implants. Thus, MR images can be obtained from the subjects even with the implanted LCP-based neural prosthetic systems providing useful diagnostic information. Furthermore, it will be also useful for functional MRI studies of the auditory perception mechanism after cochlear implantations as well as for positron emission tomography-MRI hybrid imaging.
