Automatic Localization of Cochlear Implant Electrodes in CT

Cochlear Implants (CI) are surgically implanted neural prosthetic devices used to treat severe-to-profound hearing loss. Recent studies have suggested that hearing outcomes with CIs are correlated with the location where individual electrodes in the implanted electrode array are placed, but techniques proposed for determining electrode location have been too coarse and labor intensive to permit detailed analysis on large numbers of datasets. In this paper, we present a fully automatic snake-based method for accurately localizing CI electrodes in clinical post-implantation CTs. Our results show that average electrode localization errors with the method are 0.21 millimeters. These results indicate that our method could be used in future large scale studies to analyze the relationship between electrode position and hearing outcome, which potentially could lead to technological advances that improve hearing outcomes with CIs.

[1]  Alejandro F. Frangi,et al.  Muliscale Vessel Enhancement Filtering , 1998, MICCAI.

[2]  Johan H M Frijns,et al.  Multisection CT as a valuable tool in the postoperative assessment of cochlear implant patients. , 2005, AJNR. American journal of neuroradiology.

[3]  Richard O. Duda,et al.  Pattern classification and scene analysis , 1974, A Wiley-Interscience publication.

[4]  William M. Wells,et al.  Medical Image Computing and Computer-Assisted Intervention — MICCAI’98 , 1998, Lecture Notes in Computer Science.

[5]  Kaleem Siddiqi,et al.  Flux driven automatic centerline extraction , 2005, Medical Image Anal..

[6]  Thomas Klenzner,et al.  Quality Control after Cochlear Implant Surgery by Means of Rotational Tomography , 2005, Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology.

[7]  Benoit M Dawant,et al.  Assessment of Electrode Placement and Audiological Outcomes in Bilateral Cochlear Implantation , 2011, Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology.

[8]  Benoit M Dawant,et al.  Impact of electrode design and surgical approach on scalar location and cochlear implant outcomes , 2014, The Laryngoscope.

[9]  Margaret W Skinner,et al.  In Vivo Estimates of the Position of Advanced Bionics Electrode Arrays in the Human Cochlea , 2007, The Annals of otology, rhinology & laryngology. Supplement.

[10]  Demetri Terzopoulos,et al.  Snakes: Active contour models , 2004, International Journal of Computer Vision.

[11]  Benoit M. Dawant,et al.  Automatic identification of cochlear implant electrode arrays for post-operative assessment , 2011, Medical Imaging.

[12]  Guy Marchal,et al.  Multimodality image registration by maximization of mutual information , 1997, IEEE Transactions on Medical Imaging.

[13]  Benoit M. Dawant,et al.  Image-Guidance Enables New Methods for Customizing Cochlear Implant Stimulation Strategies , 2013, IEEE Transactions on Neural Systems and Rehabilitation Engineering.