Method and apparatus for volumetric projection rendering using r

Details Method and apparatus for volumetric projection rendering using r Method and apparatus for volumetric projection rendering using r

1992-02-28

1993-07-06

Harkcom, Gary V.

395119, 395120, G06F 1562

Patent

active

052261131

ABSTRACT:
A method for providing a volumetrically-rendered projection image using reverse ray casting, uses the steps of: acquiring, from an object volume of interest, a set of data sampled from each volume element (voxel) therein responsive to a selected characteristic of that object volume; storing the data for each object voxel in a corresponding data volume element; scanning sequentially through each data voxel within the data volume corresponding to the object volume of interest; projecting each scanned data voxel to an image plane, at a solid angle determined from the solid angle at which the object volume is viewed; storing a value for each image plane pixel, responsive to a selected criteria, from the values of all projected data voxel values impingent upon that image plane pixel; and then scaling the dimensions of each image plane pixel responsive to the dimensions of the corresponding object volume shape, and the involved projection solid angle, to correct for anisotropy.

REFERENCES:
patent: 4283765 (1981-08-01), Rieser
patent: 4729098 (1988-03-01), Cline et al.
patent: 4827413 (1989-05-01), Baldwin et al.
patent: 4984157 (1991-01-01), Cline et al.
S. M. Goldwasser & R. A. Reynolds, "Real-Time Display And Manipulation of 3-D Medical Objects: The Voxel Processor Architecture, Computer Vision, Graphics & Image Processing", vol. 39, No. 1, 1987.
R. A. Robb and C. Barillot, "Interactive Display and Analysis of 3-D Medical Images", IEEE Transaction on Medical Imaging, vol. 8, No. 3, Sep. 1988.

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