2 * Creation of a small test pattern and projection data with execution of
3 * a user-defined reconstruction algorithm and analysis.
6 Example 2, A simple test pattern and projection data
7 SPECTRUM MONOCHROMATIC with energy at 75 KeV
8 OBJECTS cx cy u v ang den
9 ELIP 0.00 0.00 0.90 0.90 0.00 2.50
10 ELIP 0.00 0.00 0.80 0.60 0.00 -1.25
11 ELIP 0.00 0.00 0.21 0.25 0.00 0.10
13 PHANTOM AVERAGE 1 point for estimating pixel density
14 number of elements is 31 Size of a pixel is 0.07
15 RAYSUM AVERAGE 1 line for estimation of ray sum with weight
19 RAYS USER-defined 63 rays per projection at spacing 0.05
20 ANGLES 30 EQUAL SPACING between the first and last angles which are
23 BACKGROUND absorption is 0.0
30 MODE LOWER constraint set at 0.0 UPPER constraint set at 2.5
33 STEP projections by 10 and rays by 1
35 STOP TERMINATION VARIANCE at 0.01
37 EXECUTE AVERAGE ART SMOOTH
38 Example 2a underrelaxed art4 with variable tolerance
39 smoothing threshold is 0.2 Weights are 2.25 1.5 1.0
40 111111111111111111111111111111111111111111111111111
41 ART4 RELAXATION CONSTANT = 0.025 TOLERANCE VARIABLE decreasing
42 CONSTRAINT BOUND CONRELAX CONSTANT = 0.5 NOMLIZE at each iteration
47 Example 2b underrelaxed art with extrapolation
49 * Reset mode to unconstrained
53 Example 2a underrelaxed art4
55 2222222222222222222222222222222222222222
57 LINES COLUMNS 15 and 18 are to be printed