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Proceedings Paper

Surface-based registration of physical space with CT images using A-mode ultrasound localization of the skull
Author(s): W. Andrew Bass; Robert L. Galloway; Calvin R. Maurer
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Paper 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.

Paper Details

Date Published: 26 June 1998
PDF: 11 pages
Proc. SPIE 3335, Medical Imaging 1998: Image Display, (26 June 1998); doi: 10.1117/12.312496
Show Author Affiliations
W. Andrew Bass, Vanderbilt Univ. (United States)
Robert L. Galloway, Vanderbilt Univ. and Vanderbilt Univ. Medical Ctr. (United States)
Calvin R. Maurer, UMDS Guy's Hospital (United States)

Published in SPIE Proceedings Vol. 3335:
Medical Imaging 1998: Image Display
Yongmin Kim; Seong Ki Mun, Editor(s)

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