Application of the acta-scanner to visualization of the spine

Ledley, Robert S.; Park, Chan M.; Ray, Robert D.

doi:10.1016/0363-8235(75)90009-5

Cited by 12 publications

(2 citation statements)

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“…Variable orientation of both the volume of interest (VOI) and the illumination angle have been demonstrated in images of human lumbar vertebrae [6]. Illumination has been valuable in adding realism to a displayed scene where surface shapes are of key importance.…”

Section: Cross-sectional Imagesmentioning

confidence: 99%

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Real-time ‘computer-evaded’ pseudo-holography of computed tomography images

Webb

Noblett

1989

Medical Informatics

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An off-line method of dynamic imaging has been developed to facilitate visualization of three-dimensional tomographic data during real-time manoeuvres. Stereo-pair projection of multiple contiguous cross-sectional images on a conventional 625 line 50 Hz television raster has been investigated and pseudo-holograms have been displayed. A Cartesian stereo-pair projection model incorporating three degrees of rotational freedom and perspective has been developed. Computer simulations of the model have been conducted and the feasibility of adopting a simplified model has been examined. A condensed solution with two degrees of freedom, retaining partial perspective effects, has been simulated and analysed for worst-case errors. Reasonable projection accuracy has been demonstrated for small orientation angles. Specialized display hardware has been developed and a departure has been made from conventional picture-element (pixel) display methodology. Elemental quadrilaterals (rho-pixels), varying in size, shape and screen position, have been considered as an alternative to static square pixels in a rigid matrix. Joystick-controlled rho-pixel arrays have been implemented with parallelogram-shaped rho-pixels incorporated as a simplified case of quadrilateral projection. Dynamic stereo-pair projections of 64 X 64 rho-pixel arrays have been generated from computed tomography (CT) images and the results of phantom studies on a four-plane system are discussed.

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Section: Cross-sectional Imagesmentioning

confidence: 99%

“…cos y + sin a sin y) +yT,(cos u sin p sin ysin C( cos y) + 2 0 + NS(cos a cos B) (6) where N is an integer representing the tomogram sample containing P.…”

Section: Cartesian Projection Modelmentioning

confidence: 99%