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Design of External Coil System for Reducing Artifact of MR Image due to Implantable Hearing Aid

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Fig.  1.  Typical  implantable  hearing  aids;  (a)  cochlear  implant  (M  Co.,  Austria)  and  (b)  middle  ear  implant  (M  Co.,  Austria).
Fig.  4.  Surgical  removal  of  the  permanent  magnet  for  MRI  scan.
Fig.  5.  Distribution  of  magnetic  flux  density  due  to  the  proposed  external  coil  system;  (a)  zero  current  coil  and  (b)  current  driving  coil.
Fig. 7. Finite element model for simulation of MRI artifact; (a) total region and (b) surroundings of permanent magnet.
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