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+   snark14.s170426 - A PICTURE RECONSTRUCTION PROGRAM
+
+
+     <*>  EXAMPLE 3
+
+     <*>  CREATION OF HEAD PHANTOM. GENERATION OF POLYCHROMATIC 
+
+     <*>  PROJECTION DATA.
+
+     <*> 
+
+     <*>  CREATE A PHANTOM
+
+     <*>  GENERATE PROJECTION DATA
+
+     <#> CREATE                                                                                                                                                                                                                                                           
+
+         EXAMPLE 3 HEAD PHANTOM
+
+
+     <#> SPECTRUM POLYCHROMATIC 5
+
+         energy spectrum is polychromatic with   5     energy levels
+         with the following photon distribution
+         energy level   percent
+               40          10
+               50          30
+               60          30
+               80          20
+              100          10
+
+     <#> OBJECTS
+         description of objects
+                                                                density at levels
+ numb type  x-coord  y-coord x-length y-length    angle  av dens        40        50        60        80       100
+
+
+    1 segm   1.3750  -7.5000   1.1000   0.6250  19.2000  -0.3275   -0.7340   -0.4720   -0.2880   -0.1160   -0.0290
+
+
+    2 segm   1.3750  -7.5000   1.1000   4.3200  19.2100   0.3275    0.7340    0.4720    0.2880    0.1160    0.0290
+
+
+    3 elip   0.0000   0.0000   8.6250   6.4687  90.0000   0.5400    1.0000    0.7000    0.5000    0.3000    0.2000
+
+
+    4 elip   0.0000   0.0000   7.8750   5.7187  90.0000  -0.3300   -0.7370   -0.4750   -0.2910   -0.1180   -0.0290
+
+
+    5 elip   0.0000   1.5000   0.3750   0.3000  90.0000  -0.0029   -0.0030   -0.0060   -0.0020   -0.0010   -0.0000
+
+
+    6 segm   0.0000  -2.2500   1.1250   0.3750   0.0000  -0.0029   -0.0030   -0.0060   -0.0020   -0.0010   -0.0000
+
+
+    7 segm  -1.0000   3.7500   1.0000   0.5000 135.0000  -0.0029   -0.0030   -0.0060   -0.0020   -0.0010    0.0000
+
+
+    8 segm   1.0000   3.7500   1.0000   0.5000 225.0000  -0.0029   -0.0030   -0.0060   -0.0020   -0.0010    0.0000
+
+
+    9 elip   0.6750  -0.7500   0.2250   0.1500 140.0000   0.0127    0.0250    0.0160    0.0100    0.0080    0.0080
+
+
+   10 elip   0.7500   1.5000   0.3750   0.2250  50.0000   0.0046    0.0050    0.0040    0.0040    0.0060    0.0050
+
+
+   11 tria   5.0250   3.7500   1.1250   0.5000 110.7500   0.3300    0.7370    0.4750    0.2910    0.1180    0.0290
+
+
+   12 tria  -5.0250   3.7500   1.1250   0.5000 -110.7500   0.3300    0.7370    0.4750    0.2910    0.1180    0.0290
+
+         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
+
+
+     <#> 23 0.77
+         picture size 23 x 23,  pixel size     0.7700
+
+
+     <#> RAYSUM AVERAGE 3
+
+         this run will generate projection data
+         projection data are calculated by dividing each ray interval into 3 substrips
+
+         with aperture (substrip) weights     1     1     1
+
+
+     <#> GEOMETRY
+
+
+     <#> DIVERGENT ARC 78.0 110.0
+         rays are divergent from point sources
+         source to origin distance     78.0000
+         the detectors lie on an arc with source to detector distance =   110.0000
+
+
+     <#> RAYS USER 159 0.213
+         number of rays per projection   159
+         at detector spacing     0.2130
+
+
+     <#> ANGLE 1
+         total number of projections     1
+
+         projection angles    0.0000
+
+
+     <#> MEASUREMENT NOISY
+         noise characteristics of projection data follow
+               nature          characteristics
+
+     <#> QUANTUM 10000000.0 360.0 CALIBRATION 2
+               quantum        mean number of photons in actual measurement   1.0000e+07
+                              mean number of photons in calibration measurement is   360.0000    times above
+                              calibration is constant over all projections for any single ray
+                              mean numbers of photons entering each substrip are
+                                3.3333e+06   3.3333e+06   3.3333e+06 
+
+     <#> SCATTER 0.24 0.4445
+               scatter        the fraction scattered in line is     0.2400
+                              scatter extends to a distance of     0.4445
+                              dying linearly from the middle
+
+     <#> SEED 1
+          seed for random number generator is              1
+
+
+     <#> BACKGROUND 0.0 0.0 0.0 0.0 0.0
+                               at levels
+                                      40        50        60        80       100 
+          background absorption   0.0000    0.0000    0.0000    0.0000    0.0000 
+ 
+
+     <#> RUN 
+              0.001 seconds phantom creation
+              0.000 seconds projection data creation
+              0.002 seconds used for processing command crea
+
+
+     <#> END