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PJ 3T - ProJect - 3D volume using internal Threshold

(09/10/96)

PURPOSE

Computes a projection of a 3D density distribution along two specified angles (azimuth angle, PHI, and tilt angle, THETA), with values within the threshold boundaries contributing to the projection.

SEE ALSO

PJ 3 [ProJect - 3D volume]
PJ 3E [ProJect - 3D volume using Eulerian angles, fast]
PJ 3Q [ProJect - 3D volume using Eulerian angles]
PJ AT [ProJect - 3D volume using exponential ATtenuation]
PJ CYL [ProJect - 3D volume onto cylinder]

USAGE

.OPERATION: PJ 3T

.THREED FILE: PIC001
[Enter the name of the file whose projection is to be computed.]

.UPPER, LOWER THRESHOLD: 20,0.1
[Enter density range that is to be used for the projection. If in this example the volume has a density range from 0 to 0.5, all voxels larger than 0.1 will contribute.]

.PROJECTION SAMPLE DIM.: 110,78
[Enter the X dimension and (optional) Y dimension for the projection file equal to, or smaller than, the volume sidelength. If Y dimension = 0 then the Y dimension is chosen such that the X/Y ratio in the projection is the same as in the volume. Arbitrary dimensions can be used.]

.OUTPUT FILE: PRJ001
[Enter the name of the file where the projection is to be stored.]

.AZIMUTH ANGLE (PHI): 45.5
[Enter the azimuth angle, in degrees.]

.TILT ANGLE (THETA): -30.0
[Enter the tilt angle, in degrees.]

[For this example, the projection of PIC001 with PHI equal to 45.5 and THETA equal to -30.0 is computed and stored in PRJ001.]

SUBROUTINES

PROJ3

CALLER

VTIL2

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