[Rtk-users] trouble projecting phantom

[M Miller]

I've been unable to project a phantom, or anything else, at high magnification. Here's the steps I've think should work, but don't.
 
"rtksimulatedgeometry.exe --output=geo.xml --nproj=1600 --arc=360 --sdd=870.86 --sid=65.93"
 
These are the values from my actual CT system. Next I try using rtkprojectgeometricphantom to create some projections.
 
"rtkprojectgeometricphantom -g geo.xml -o projs\projections1024.mha --spacing 1 --dimension 1024 --phantomfile 
SheppLogan.txt"
 
Inspecting the output projections shows they're mostly unrecognizable. Repeating these steps with a higher SID does produce the expected phantom projections. I've had no luck using real data, so I thought I'd try a simple phantom, but it's turned out to be not so simple.
 
Is RTK limited somehow with respect to magnification, or are my expectations unrealsitic? Am I missing a command-line switch?
 
Thanks
Micah
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