Concurrent display and adjustment of 3D projection, coronal slic

Details Concurrent display and adjustment of 3D projection, coronal slic Concurrent display and adjustment of 3D projection, coronal slic

1991-11-29

1994-12-06

Dzierzynski, Paul M.

Boots, shoes, and leggings

378901, 395127, G06F 1542, G06F 1562

Patent

active

053717783

ABSTRACT:
A CT scanner (A) non-invasively examines a volumetric region of a subject and generates volumetric image data indicative thereof. An object memory (B) stores the data values corresponding to each voxel of the volume region. An affine transform algorithm (60) operates on the visible faces (24, 26, 28) of the volumetric region to translate the faces from object space to projections of the faces onto a viewing plane in image space. An operator control console (E) includes operator controls for selecting an angular orientation of a projection image of the volumetric region relative to a viewing plane, i.e. a plane of the video display (20). A cursor positioning trackball (90) inputs i- and j-coordinate locations in image space which are converted (92) into a cursor crosshair display (30) on the projection image (22). A depth dimension k between the viewing plane and the volumetric region in a viewing direction perpendicular to the viewing plane is determined (74). The (i,j,k) image space location of the cursor is operated upon by the reverse of the selected transform to identify a corresponding (x,y,z) cursor coordinate in object space. The cursor coordinate in object space is translated (100, 102,104) into corresponding addresses of the object memory for transverse, coronal, and sagittal planes (10, 12, 14) through the volumetric region.

REFERENCES:
patent: 4259725 (1981-03-01), Andrews et al.
patent: 4858129 (1989-08-01), Mori
patent: 4882679 (1989-11-01), Tuy et al.
patent: 5250933 (1993-10-01), Beaudin et al.
Fundamentals of Three-Dimensional Computer Graphics, Alan Watt Copyright 1989, Addison-Wesley Publishers Ltd. pp. 21-22; 2-6.

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