1 snark14.s170426 - A PICTURE RECONSTRUCTION PROGRAM
6 <*> CREATION OF HEAD PHANTOM. GENERATION OF POLYCHROMATIC
14 <*> GENERATE PROJECTION DATA
18 EXAMPLE 3 HEAD PHANTOM
21 <#> SPECTRUM POLYCHROMATIC 5
23 energy spectrum is polychromatic with 5 energy levels
24 with the following photon distribution
33 description of objects
35 numb type x-coord y-coord x-length y-length angle av dens 40 50 60 80 100
38 1 segm 1.3750 -7.5000 1.1000 0.6250 19.2000 -0.3275 -0.7340 -0.4720 -0.2880 -0.1160 -0.0290
41 2 segm 1.3750 -7.5000 1.1000 4.3200 19.2100 0.3275 0.7340 0.4720 0.2880 0.1160 0.0290
44 3 elip 0.0000 0.0000 8.6250 6.4687 90.0000 0.5400 1.0000 0.7000 0.5000 0.3000 0.2000
47 4 elip 0.0000 0.0000 7.8750 5.7187 90.0000 -0.3300 -0.7370 -0.4750 -0.2910 -0.1180 -0.0290
50 5 elip 0.0000 1.5000 0.3750 0.3000 90.0000 -0.0029 -0.0030 -0.0060 -0.0020 -0.0010 -0.0000
53 6 segm 0.0000 -2.2500 1.1250 0.3750 0.0000 -0.0029 -0.0030 -0.0060 -0.0020 -0.0010 -0.0000
56 7 segm -1.0000 3.7500 1.0000 0.5000 135.0000 -0.0029 -0.0030 -0.0060 -0.0020 -0.0010 0.0000
59 8 segm 1.0000 3.7500 1.0000 0.5000 225.0000 -0.0029 -0.0030 -0.0060 -0.0020 -0.0010 0.0000
62 9 elip 0.6750 -0.7500 0.2250 0.1500 140.0000 0.0127 0.0250 0.0160 0.0100 0.0080 0.0080
65 10 elip 0.7500 1.5000 0.3750 0.2250 50.0000 0.0046 0.0050 0.0040 0.0040 0.0060 0.0050
68 11 tria 5.0250 3.7500 1.1250 0.5000 110.7500 0.3300 0.7370 0.4750 0.2910 0.1180 0.0290
71 12 tria -5.0250 3.7500 1.1250 0.5000 -110.7500 0.3300 0.7370 0.4750 0.2910 0.1180 0.0290
73 scale factor multiplying object densities 1.0000
76 inhomogeneity set to 0.0000
80 this run will generate a phantom
81 density in each pixel is obtained as the average of 1 x 1 points
85 picture size 23 x 23, pixel size 0.7700
90 this run will generate projection data
91 projection data are calculated by dividing each ray interval into 3 substrips
93 with aperture (substrip) weights 1 1 1
99 <#> DIVERGENT ARC 78.0 110.0
100 rays are divergent from point sources
101 source to origin distance 78.0000
102 the detectors lie on an arc with source to detector distance = 110.0000
105 <#> RAYS USER 159 0.213
106 number of rays per projection 159
107 at detector spacing 0.2130
111 total number of projections 1
113 projection angles 0.0000
116 <#> MEASUREMENT NOISY
117 noise characteristics of projection data follow
118 nature characteristics
120 <#> QUANTUM 10000000.0 360.0 CALIBRATION 2
121 quantum mean number of photons in actual measurement 1.0000e+07
122 mean number of photons in calibration measurement is 360.0000 times above
123 calibration is constant over all projections for any single ray
124 mean numbers of photons entering each substrip are
125 3.3333e+06 3.3333e+06 3.3333e+06
127 <#> SCATTER 0.24 0.4445
128 scatter the fraction scattered in line is 0.2400
129 scatter extends to a distance of 0.4445
130 dying linearly from the middle
133 seed for random number generator is 1
136 <#> BACKGROUND 0.0 0.0 0.0 0.0 0.0
139 background absorption 0.0000 0.0000 0.0000 0.0000 0.0000
143 0.001 seconds phantom creation
144 0.000 seconds projection data creation
145 0.002 seconds used for processing command crea