Use of tuned aperture computed tomography (TACT) with a large-scale imaging panel for 3D tomography of the skull

Robert H. Vandre; Richard L. Webber; Roger A. Horton; Denny L. Y. Lee; Lothar S. Jeromin

doi:10.1117/12.237850

11 April 1996 Use of tuned aperture computed tomography (TACT) with a large-scale imaging panel for 3D tomography of the skull

Robert H. Vandre, Richard L. Webber, Roger A. Horton, Denny L. Y. Lee, Lothar S. Jeromin

Author Affiliations +

Proceedings Volume 2708, Medical Imaging 1996: Physics of Medical Imaging; (1996) https://doi.org/10.1117/12.237850
Event: Medical Imaging 1996, 1996, Newport Beach, CA, United States

Abstract

Surgeons often need to localize foreign objects in wounded patients in facilities where computed tomography (CT) may not be present or is contraindicated by anticipation of massive CT artifacts associated with imaging radiopaque materials such as shrapnel. A skull phantom was placed on top of a 22 by 18 cm radiographic imaging panel developed by Du Pont Diagnostic Imaging Systems in both posterior-anterior (PA) and lateral orientations. A radiopaque reference sphere (2 mm dia.) was attached to the phantom and a set of eight, two- dimensional radiographic projections was obtained for each of the two orientations. This was done by laterally displacing the x-ray head in a plane parallel to the projection panel to eight different positions well distributed around the periphery of a solid angle approximating 25 degrees. An operator identified the reference shadow on each digital projection. This information was used by the TACT system to compute tomographic slices based on the reference sphere's relative displacement in the field. These TACT slices were compared directly with tomographs of the same region of the skull made with a Phillips Model BTS4 tomographic machine. Both methods appeared to yield clinically interpretable images of comparable diagnostic quality.

Citation Download Citation

Robert H. Vandre, Richard L. Webber, Roger A. Horton, Denny L. Y. Lee, and Lothar S. Jeromin "Use of tuned aperture computed tomography (TACT) with a large-scale imaging panel for 3D tomography of the skull", Proc. SPIE 2708, Medical Imaging 1996: Physics of Medical Imaging, (11 April 1996); https://doi.org/10.1117/12.237850

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