1 snark14.s170426 - A PICTURE RECONSTRUCTION PROGRAM
6 <*> STAR PATTERN WITH PSEUDO PROJECTION DATA
8 <*> RECONSTRUCTION BY ART
14 EXAMPLE 4 STAR PATTERN
17 <#> SPECTRUM MONOCHROMATIC 10
18 energy spectrum is monochromatic at energy level 10
22 description of objects
24 numb type x-coord y-coord x-length y-length angle av dens 10
26 1 sect 0.0000 -24.0000 6.0000 24.0000 0.0000 1.0000 1.0000
28 2 sect 21.0000 -12.0000 6.0000 24.0000 60.0000 1.0000 1.0000
30 3 sect 21.0000 12.0000 6.0000 24.0000 120.0000 1.0000 1.0000
32 4 sect 0.0000 24.0000 6.0000 24.0000 180.0000 1.0000 1.0000
34 5 sect -21.0000 12.0000 6.0000 24.0000 240.0000 1.0000 1.0000
36 6 sect -21.0000 -12.0000 6.0000 24.0000 300.0000 1.0000 1.0000
38 scale factor multiplying object densities 1.0000
41 inhomogeneity set to 0.0000
45 this run will generate a phantom
46 density in each pixel is obtained as the average of 1 x 1 points
49 <#> 25 PIXELS OF SIZE 2.0
50 picture size 25 x 25, pixel size 2.0000
55 0.000 seconds phantom creation
56 0.000 seconds used for processing command crea
63 EXAMPLE 4 STAR PATTERN
67 energy spectrum is monochromatic at energy level 10
71 description of objects
73 numb type x-coord y-coord x-length y-length angle av dens 10
75 1 sect 0.0000 -24.0000 6.0000 24.0000 0.0000 1.0000 1.0000
77 2 sect 21.0000 -12.0000 6.0000 24.0000 60.0000 1.0000 1.0000
79 3 sect 21.0000 12.0000 6.0000 24.0000 120.0000 1.0000 1.0000
81 4 sect 0.0000 24.0000 6.0000 24.0000 180.0000 1.0000 1.0000
83 5 sect -21.0000 12.0000 6.0000 24.0000 240.0000 1.0000 1.0000
85 6 sect -21.0000 -12.0000 6.0000 24.0000 300.0000 1.0000 1.0000
87 scale factor multiplying object densities 1.0000
90 inhomogeneity set to 0.0000
94 density in each pixel is obtained as the average of 1 x 1 points
97 <#> pixe 25 size 2.0000
98 picture size 25 x 25, pixel size 2.0000
101 EXAMPLE 4 STAR PATTERN
102 0.000 seconds used for processing command pict
107 <#> PROJECTION PSEUDO
109 EXAMPLE 4 PSEUDO PROJECTION DATA FOR TWELVE VIEWS
116 <#> PARALLEL VARIABLE STRIP
117 rays are parallel with variable spacing between rays
118 data collected along strips
122 <#> RAYS PROGRAM 25 2.0 DETECTOR SPACING AT 2.0
123 number of rays per projection 53
124 snark computed number of rays 53
125 at detector spacing 2.0000
128 <#> ANGLES 12 EQUALLY SPACED
129 total number of projections 12
131 projection angles 0.0000 15.0000 30.0000 45.0000 60.0000 75.0000 90.0000 105.0000 120.0000 135.0000
135 <#> MEASUREMENT PERFECT
136 projection data are noiseless
142 background absorption 50.0000
144 estimate of totlen = 16985.417500
145 estimate of totden = 6066.137812
146 estimate of average density = 0.3571
148 EXAMPLE 4 PSEUDO PROJECTION DATA FOR TWELVE VIEWS
149 0.000 seconds used for processing command proj
154 <#> MODE LOWER CONSTRAINT IS SET TO 0.0 UPPER CONSTRAINT IS 1.0
155 lower constraint set to 0.0000
156 upper constraint set to 1.0000
157 0.000 seconds used for processing command mode
162 <#> SELECT SNARK RAYSEQ
165 sequential ray selection with ray-step 1 and projection-step 3
166 0.000 seconds used for processing command sele
173 0.000 seconds used for processing command stop
178 <#> EXECUTE ART CONTOUR
180 EXAMPLE 4 ART RECONSTRUCTION
183 reconstruction is contoured after
187 threshold = 0.50000 w1 = 0.00000 w2 = 1.00000 w3 = 0.00000
191 relaxation parameter is 1.0
195 <#> CONSTRAINT BOUND STEPS 204
196 constraint set to boundaries
197 picture is not normalized
198 204 rays are used for each iteration
199 lower constraint = 0.0000
200 upper constraint = 1.0000
201 algorithm executed in iteration 1
202 0.001 seconds for the execution of the algorithm
203 iteration 1 completed
204 0.001 seconds for this iteration
205 algorithm executed in iteration 2
206 0.000 seconds for the execution of the algorithm
207 iteration 2 completed
208 0.000 seconds for this iteration
209 algorithm executed in iteration 3
210 0.000 seconds for the execution of the algorithm
211 iteration 3 completed
212 0.000 seconds for this iteration
213 algorithm executed in iteration 4
214 0.000 seconds for the execution of the algorithm
215 iteration 4 completed
216 0.000 seconds for this iteration
217 algorithm executed in iteration 5
218 0.000 seconds for the execution of the algorithm
219 iteration 5 completed
220 0.000 seconds for this iteration
221 algorithm executed in iteration 6
222 0.000 seconds for the execution of the algorithm
223 iteration 6 completed
224 0.000 seconds for this iteration
225 algorithm executed in iteration 7
226 0.000 seconds for the execution of the algorithm
227 iteration 7 completed
228 0.000 seconds for this iteration
229 algorithm executed in iteration 8
230 0.000 seconds for the execution of the algorithm
231 iteration 8 completed
232 0.000 seconds for this iteration
233 algorithm executed in iteration 9
234 0.000 seconds for the execution of the algorithm
235 reconstruction completed after iteration 9
236 0.000 seconds for this iteration
237 0.001 seconds for all iterations
238 0.002 seconds used for processing command exec