Surface-based registration of physical space with CT images using A-mode ultrasound localization of the skull

W. Andrew Bass; Robert L. Galloway Jr.; Calvin R. Maurer Jr.

doi:10.1117/12.312496

26 June 1998 Surface-based registration of physical space with CT images using A-mode ultrasound localization of the skull

W. Andrew Bass, Robert L. Galloway Jr., Calvin R. Maurer Jr.

Author Affiliations +

Proceedings Volume 3335, Medical Imaging 1998: Image Display; (1998) https://doi.org/10.1117/12.312496
Event: Medical Imaging '98, 1998, San Diego, CA, United States

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.

Citation Download Citation

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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