--- /dev/null
+ 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
projects / snark14.git / blobdiff