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<DIV>Dear rtk users,</DIV>
<DIV> </DIV>
<DIV>I ran into a small problem with the geometric phantom filter
(rtk::DrawGeometricPhantomImageFilter).</DIV>
<DIV> </DIV>
<DIV>Here comes the description:</DIV>
<DIV> </DIV>
<DIV>Input:</DIV>
<DIV>Geometry: Magnification = 1 (virtual detector at the image center)</DIV>
<DIV> </DIV>
<DIV>GeometricFile: [Box]
A=50.
B=50.
C=50.
x=0.
y=0.
z=0.
beta=0 gray=5.</DIV>
<DIV>Spacing: 1</DIV>
<DIV>Dimension: 150</DIV>
<DIV>centered.</DIV>
<DIV> </DIV>
<DIV>Projection stack: </DIV>
<DIV>Spacing: 1</DIV>
<DIV>Dimension: 1500 (much larger than the projection)</DIV>
<DIV> </DIV>
<DIV>Projector: </DIV>
<DIV>CudaForwardProjectionImageFilter (step=0.1)</DIV>
<DIV> </DIV>
<DIV>Problem:</DIV>
<DIV>If I connect the output of drawGeometricPhantom filter to the input of the
projector (input 1), the result has non-zero pixels on the projection image
which is not part of the projection.</DIV>
<DIV>If I write and read the output drawGeometricPhantom filter to and from the
disc first, the result is correct, i.e. there is nothing but the projection of
the object.</DIV>
<DIV> </DIV>
<DIV>Question:</DIV>
<DIV>Can anyone reproduce this? Why is there such a difference? </DIV>
<DIV> </DIV>
<DIV>Best regards,</DIV>
<DIV>Louie</DIV></DIV></DIV></BODY></HTML>