[Insight-users] Problem with DRR generation
Jian Wu
eewujian at hotmail.com
Wed Dec 28 23:44:09 EST 2005
Dear ITK users:
I'm wondering if anyone have generated correction DRRs using the example
programs GenerateProjection.cxx or DigitallyReconstructedRadiograph1.cxx.
I ran both codes using the parameters and the image given in the README.txt
file. But the generated DRRs appear to have a different projection and image
center than I expected.
I also tried to simply the test data in
DigitallyReconstructedRadiograph1.cxx. Instead of using the orignal cubic
structure, I constructed a 61x61x61 3D image with a single point at the
center of the image. The resulting DRR has a point centered at pixel index
(81, 81). The DRR has the size of 501x501, and the point is supposed to be
at the center of the image. I can't figure out how the projection works. I
really wish the projection geometry were better documented.
When real CT data sets were used, the objects in the output DRRs appear to
have been shifted toward the left-bottom corner of the images. I searched
the emails that have been posted before. It appears someone has pointed out
the problem before. However, I did not find any answers to the question. By
the way, the IntensityBased2D3DRegistration.cxx example code does not work.
I have posted the problem a couple of days ago.
Someone help me out please!
Jian Wu
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