Hi, I have been trying to set the geometry in ThreeDCircularProjectionGeometry with values between 0 and 180 degrees, to reproduce the motion of some acquisition systems, but reconstruction is far from the expected result when the gantry angle does not reach max value of (360-increment). (Attached is the geometry file generated)
My workflow is the following : - Apply JosephForwardProjectionImageFilter on a 3D Volume - Try to reconstruct using FDKConeBeamReconstructionFilter Although, the result from JosephForwardProjectionImageFilter describes a 180 degrees rotation, the output of the reconstruction seems to display rays from opposite direction but not from rotated directions Here is a view of what is supposed to be an axial slice: [image: image.png] Thanks for your help! Clément
<?xml version="1.0"?>
<!DOCTYPE RTKGEOMETRY>
<RTKThreeDCircularGeometry version="3">
<SourceToIsocenterDistance>600</SourceToIsocenterDistance>
<SourceToDetectorDistance>1200</SourceToDetectorDistance>
<Projection>
<GantryAngle>0</GantryAngle>
<Matrix>
-1200 0 0 0
0 -1200 0 0
0 0 1 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>2</GantryAngle>
<Matrix>
-1199.26899242291 0 41.8793960430012 0
0 -1200 0 0
0.034899496702501 0 0.999390827019096 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>4</GantryAngle>
<Matrix>
-1197.07686031179 0 83.7077684929504 0
0 -1200 0 0
0.0697564737441253 0 0.997564050259824 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>6</GantryAngle>
<Matrix>
-1193.42627444193 0 125.434155921184 0
0 -1200 0 0
0.104528463267653 0 0.994521895368273 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>8</GantryAngle>
<Matrix>
-1188.32168248988 0 167.007721152079 0
0 -1200 0 0
0.139173100960065 0 0.99026806874157 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>10</GantryAngle>
<Matrix>
-1181.76930361465 0 208.377813200316 0
0 -1200 0 0
0.17364817766693 0 0.984807753012208 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>12</GantryAngle>
<Matrix>
-1173.77712088057 0 249.494028981311 0
0 -1200 0 0
0.207911690817759 0 0.978147600733806 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>14</GantryAngle>
<Matrix>
-1164.3548715312 0 290.306274719601 0
0 -1200 0 0
0.241921895599668 0 0.970295726275996 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>16</GantryAngle>
<Matrix>
-1153.51403512598 0 330.764826980399 0
0 -1200 0 0
0.275637355816999 0 0.961261695938319 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>18</GantryAngle>
<Matrix>
-1141.26781955418 0 370.820393249937 0
0 -1200 0 0
0.309016994374947 0 0.951056516295154 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>20</GantryAngle>
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</Matrix>
</Projection>
<Projection>
<GantryAngle>22</GantryAngle>
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0 -1200 0 0
0.374606593415912 0 0.927183854566787 -600
</Matrix>
</Projection>
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<GantryAngle>24</GantryAngle>
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</Matrix>
</Projection>
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</Matrix>
</Projection>
<Projection>
<GantryAngle>28</GantryAngle>
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0.469471562785891 0 0.882947592858927 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>30</GantryAngle>
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0.5 0 0.866025403784439 -600
</Matrix>
</Projection>
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</Matrix>
</Projection>
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<GantryAngle>34</GantryAngle>
<Matrix>
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0 -1200 0 0
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</Matrix>
</Projection>
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<GantryAngle>36</GantryAngle>
<Matrix>
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</Matrix>
</Projection>
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</Matrix>
</Projection>
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</Matrix>
</Projection>
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<GantryAngle>42</GantryAngle>
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</Matrix>
</Projection>
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</Matrix>
</Projection>
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</Matrix>
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</Matrix>
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</Matrix>
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</Matrix>
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</Matrix>
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</Matrix>
</Projection>
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0.866025403784439 0 0.5 -600
</Matrix>
</Projection>
<Projection>
<GantryAngle>62</GantryAngle>
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</Matrix>
</Projection>
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</Matrix>
</Projection>
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</Matrix>
</Projection>
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</Matrix>
</Projection>
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</Matrix>
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</Matrix>
</Projection>
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<GantryAngle>74</GantryAngle>
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</Matrix>
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</Matrix>
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</Matrix>
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</Matrix>
</Projection>
</RTKThreeDCircularGeometry>
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