snark14.s170426 - A PICTURE RECONSTRUCTION PROGRAM <*> *******EXAMPLE 4 <*> STAR PATTERN WITH PSEUDO PROJECTION DATA <*> RECONSTRUCTION BY ART <*> <#> CREATE EXAMPLE 4 STAR PATTERN <#> SPECTRUM MONOCHROMATIC 10 energy spectrum is monochromatic at energy level 10 <#> OBJECTS description of objects density at levels numb type x-coord y-coord x-length y-length angle av dens 10 1 sect 0.0000 -24.0000 6.0000 24.0000 0.0000 1.0000 1.0000 2 sect 21.0000 -12.0000 6.0000 24.0000 60.0000 1.0000 1.0000 3 sect 21.0000 12.0000 6.0000 24.0000 120.0000 1.0000 1.0000 4 sect 0.0000 24.0000 6.0000 24.0000 180.0000 1.0000 1.0000 5 sect -21.0000 12.0000 6.0000 24.0000 240.0000 1.0000 1.0000 6 sect -21.0000 -12.0000 6.0000 24.0000 300.0000 1.0000 1.0000 scale factor multiplying object densities 1.0000 seed set to 0 inhomogeneity set to 0.0000 <#> PHANTOM AVERAGE 1 this run will generate a phantom density in each pixel is obtained as the average of 1 x 1 points <#> 25 PIXELS OF SIZE 2.0 picture size 25 x 25, pixel size 2.0000 <#> RAYSUM 0.000 seconds phantom creation 0.000 seconds used for processing command crea <*> <#> PICTURE TEST EXAMPLE 4 STAR PATTERN <#> spec mono 10 energy spectrum is monochromatic at energy level 10 <#> obje description of objects density at levels numb type x-coord y-coord x-length y-length angle av dens 10 1 sect 0.0000 -24.0000 6.0000 24.0000 0.0000 1.0000 1.0000 2 sect 21.0000 -12.0000 6.0000 24.0000 60.0000 1.0000 1.0000 3 sect 21.0000 12.0000 6.0000 24.0000 120.0000 1.0000 1.0000 4 sect 0.0000 24.0000 6.0000 24.0000 180.0000 1.0000 1.0000 5 sect -21.0000 12.0000 6.0000 24.0000 240.0000 1.0000 1.0000 6 sect -21.0000 -12.0000 6.0000 24.0000 300.0000 1.0000 1.0000 scale factor multiplying object densities 1.0000 seed set to 0 inhomogeneity set to 0.0000 <#> phan aver 1 density in each pixel is obtained as the average of 1 x 1 points <#> pixe 25 size 2.0000 picture size 25 x 25, pixel size 2.0000 test picture read EXAMPLE 4 STAR PATTERN 0.000 seconds used for processing command pict <*> <#> PROJECTION PSEUDO EXAMPLE 4 PSEUDO PROJECTION DATA FOR TWELVE VIEWS <#> GEOMETRY <#> PARALLEL VARIABLE STRIP rays are parallel with variable spacing between rays data collected along strips <#> RAYS PROGRAM 25 2.0 DETECTOR SPACING AT 2.0 number of rays per projection 53 snark computed number of rays 53 at detector spacing 2.0000 <#> ANGLES 12 EQUALLY SPACED total number of projections 12 projection angles 0.0000 15.0000 30.0000 45.0000 60.0000 75.0000 90.0000 105.0000 120.0000 135.0000 150.0000 165.0000 <#> MEASUREMENT PERFECT projection data are noiseless <#> BACKGROUND 50.0 at levels 10 background absorption 50.0000 estimate of totlen = 16985.417500 estimate of totden = 6066.137812 estimate of average density = 0.3571 projection data read EXAMPLE 4 PSEUDO PROJECTION DATA FOR TWELVE VIEWS 0.000 seconds used for processing command proj <*> <#> MODE LOWER CONSTRAINT IS SET TO 0.0 UPPER CONSTRAINT IS 1.0 lower constraint set to 0.0000 upper constraint set to 1.0000 0.000 seconds used for processing command mode <*> <#> SELECT SNARK RAYSEQ <#> STEP 3 1 sequential ray selection with ray-step 1 and projection-step 3 0.000 seconds used for processing command sele <*> <#> STOP ITERATION 9 9 iterations 0.000 seconds used for processing command stop <*> <#> EXECUTE ART CONTOUR EXAMPLE 4 ART RECONSTRUCTION <#> 0.5 0.0 1.0 reconstruction is contoured after last iteration threshold = 0.50000 w1 = 0.00000 w2 = 1.00000 w3 = 0.00000 <#> ART3 art3 method relaxation parameter is 1.0 norm is 2 tolerance is 0.0 <#> CONSTRAINT BOUND STEPS 204 constraint set to boundaries picture is not normalized 204 rays are used for each iteration lower constraint = 0.0000 upper constraint = 1.0000 algorithm executed in iteration 1 0.001 seconds for the execution of the algorithm iteration 1 completed 0.001 seconds for this iteration algorithm executed in iteration 2 0.000 seconds for the execution of the algorithm iteration 2 completed 0.000 seconds for this iteration algorithm executed in iteration 3 0.000 seconds for the execution of the algorithm iteration 3 completed 0.000 seconds for this iteration algorithm executed in iteration 4 0.000 seconds for the execution of the algorithm iteration 4 completed 0.000 seconds for this iteration algorithm executed in iteration 5 0.000 seconds for the execution of the algorithm iteration 5 completed 0.000 seconds for this iteration algorithm executed in iteration 6 0.000 seconds for the execution of the algorithm iteration 6 completed 0.000 seconds for this iteration algorithm executed in iteration 7 0.000 seconds for the execution of the algorithm iteration 7 completed 0.000 seconds for this iteration algorithm executed in iteration 8 0.000 seconds for the execution of the algorithm iteration 8 completed 0.000 seconds for this iteration algorithm executed in iteration 9 0.000 seconds for the execution of the algorithm reconstruction completed after iteration 9 0.000 seconds for this iteration 0.001 seconds for all iterations 0.002 seconds used for processing command exec <*> <#> END