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Title page for ETD etd-05082006-104646


Type of Document Master's Thesis
Author Al-Marzouqi, Hasan Mohammed
URN etd-05082006-104646
Title Automatic planning of a safe drilling path to be used in cochlear implantation surgery using image registration techniques
Degree Master of Science
Department Electrical Engineering
Advisory Committee
Advisor Name Title
Benoit Dawant Committee Member
Michael Fitzpatrick Committee Member
Keywords
  • image segmentation
  • image guided surgery
  • Computer-assisted surgery
  • Stereotaxic techniques
  • Cochlear implants
  • cochlear implantation
  • atlas based segmentation
  • image registration
Date of Defense 2006-05-04
Availability unrestricted
Abstract
The procedure currently used for cochlear implantation can be improved with the aid of techniques developed in medical imaging. A suitable path accessing the cochlea can be determined before the operation by locating a point in the facial recess and another point in the basal turn of the cochlear on the CT image of the patientís ear. Outlines of those two structures are drawn by a qualified surgeon creating an atlas that is used to identify the same structures in the patientsí ears. By registering the atlas image to the patient image and tracking the deformations applied to the labeled voxels in the atlas, the location of those structures can be determined. A 12 parameter affine registration is performed first using mutual information as a similarity measure. After that a non rigid registration algorithm (Adaptive Bases Algorithm) is applied to register the ear in the atlas to the patientís ear. The structures outlined in the atlas are deformed using the computed transformations and the resulting intensity centroids are used to draw the required safe path. The developed algorithm succeeded in finding a suitable path in all of the nine ears it was tested on.

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