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Cochlear Implants: Three-dimensional Localization by Means of Coregistration of CT and Conventional Radiographs¹

¹ From the Mallinckrodt Institute of Radiology (B.R.W., K.T.B.) and Department of Otolaryngology–Head and Neck Surgery (M.W.S.), Washington University School of Medicine, 510 S Kingshighway Blvd, St Louis, MO 63110. Received January 10, 2001; revision requested March 5; revision received April 3; accepted May 1. Supported in part by the Mallinckrodt Institute of Radiology and Electronic Radiology Lab, National Institute on Deafness and Other Communication Disorders (grant R01-DC00581), and the Whitaker Foundation (Biomedical Engineering Program). Address correspondence to B.R.W. (e-mail: whitingb@mir.wustl.edu).

With use of radiopaque implanted objects as internal fiducial markers, the authors developed and evaluated a technique for coregistering computed tomographic (CT) and computed radiographic images to help determine three-dimensional location information for implant electrodes in the cochlea in phantoms and patients. Three-dimensional positional data from CT were assigned on a radiograph, which permitted identification of individual cochlear electrode locations that were not depicted at CT.

Index terms: Computed tomography (CT), image processing, 21.12115, 21.12117, 21.1215 • Computed tomography (CT), technology, 21.12115, 21.12117, 21.1215 • Computed tomography (CT), three-dimensional, 21.12117 • Ear, CT, 21.12115, 21.12117, 21.1215 • Ear, labyrinth, 21.12115, 21.12117, 21.1215 • Phantoms • Radiography, digital, 21.1215

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