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26 June 1998 Surface-based registration of physical space with CT images using A-mode ultrasound localization of the skull
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Abstract
A method is described for computing the registration of computed tomography (CT) images of the head with physical space using the outer surface of the skull for registration. A head phantom is constructed by placing a latex swim cap over a plastic skull and pouring a gelatin mixture into the space between skull and cap. A Panametrics 10.0 MHz immersion type ultrasound transducer has been rigidly attached to an optically tracked probe. This device is swept across the phantom to localize the surface of the skull. A standard deviation sliding filter is applied to the ultrasound signals to determine the location of the skull echoes. A CT derived model of the surface of the skull is generated using contours obtained from a deformable model-based segmentation algorithm. The CT and ultrasound surfaces are registered using a modified iterative closest point (ICP) algorithm. Results of a phantom experiment, validated with the Vanderbilt fiducial marker system, show target registration errors less than 4 mm. This result shows the feasibility of performing physical space to CT space registration using the outer surface of the skull.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
W. Andrew Bass, Robert L. Galloway Jr., and Calvin R. Maurer Jr. "Surface-based registration of physical space with CT images using A-mode ultrasound localization of the skull", Proc. SPIE 3335, Medical Imaging 1998: Image Display, (26 June 1998); https://doi.org/10.1117/12.312496
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