Graeme Clark Collection

Permanent URI for this collection

http://hdl.handle.net/11343/375

Filters

2000 - 2001 2
Reset filters

Settings
Statistics
Citations
End date: 2009 × Start date: 2000 × Type: Journal Article × Subject: cochlear implant × Subject: electrode position ×

Search Results

Now showing 1 - 2 of 2
  • Item
    Thumbnail Image
    The role of radiographic phase-contrast imaging in the development of intracochlear electrode arrays
    XU, JIN ; Stevenson, Andrew W. ; Gao, Dachao ; TYKOCINSKI, MICHAEL ; LAWRENCE, DAVID ; Wilkins, Stephen W. ; Clark, Graeme M. ; Saunders, Elaine ; Cowan, Robert S. ( 2001)
    Objective: This study describes the application of a new radiographic imaging modality, phase-contrast radiography, to in vitro human temporal bone imaging and investigates it use in the development of new electrode arrays for cochlear implants. Background: The development of perimodiolar electrode arrays for cochlear implants requires detailed information from postoperative radiologic assessment on the position of the array in relation to the cochlear structures. Current standard radiographic techniques provide only limited details. Materials and Methods: Nucleus standard electrode arrays and perimodiolar Contour electrode arrays were implanted into the scala tympani of 11 human temporal bones. Both conventional and phase-contrast radiographs were taken of each temporal bone for comparative purposes. Results: Phase-contrast imaging provides better visulization of anatomic details of the inner ear and of the structure of the intracochlear electrode array, and better definition of electrode location in relation to cochlear walls. Conclusion: Phase-contrast radiography offers significant improvement over conventional radiography in images of in vitro human temporal bones. It seems to be a valuable tool in the development of intracochlear electrode arrays and cochlear implant research. However, this new radiographic technique still requires certain computational and physics challenges to be addressed before its clinical use can be established.
  • Item
    Thumbnail Image
    Cochlear view: postoperative radiography for cochlear implantation
    XU, JIN ; Xu, Shi-Ang ; Cohen, Lawrence T. ; Clark, Graeme M. ( 2000)
    Objective: This study aimed to define a spatial position of the cochlea in the skull based on anatomical studies and to design an appropriate method of skull radiography for demonstration of the multichannel intracochlear electrode array and the structures of the inner ear, for use in evaluating the electrode position and its related pitch perception. Background: The conventional skull radiograph (plain radiograph)can offer a complete and direct image of an intracochlear electrode array, if the x-ray is directed to the cochlea and parallel to the axis of the cochlea. Methods: Measurement from computed tomography imaging and three-dimensional reconstruction were performed to define the spatial position of the cochlea in the skull. Results: A radiographic projection, the cochlear view, was designed. A detailed radiographic method and radiologic interpretation of the cochlear view is described. An improved clinical method for measuring the longitudinal and angular position of the electrodes from the cochlear view is recommended. Conclusions: The application of the cochlear view has proved that it is beneficial postoperatively in documenting the results of cochlear implantation, and in evaluating the depth of insertion and position of individual electrodes. It serves as a valuable reference for managing frequency mapping, optimizing speech processing strategies, and further research purposes. The method can be widely used in cochlear implant clinics because of its simplicity, low radiation, speed, and minimal cost.