[Castor-users] Problem on Reconstruction from GATE root output

[Ying-yu Chen]

Dear CASToR users,

I'm trying to build an PET simulation using the GATE ecat system. The
Geometry macro "Geometry.mac" is attached for reference.

I first simulated two 2.5mm-radius sphere sources in a phantom.From raw
sinogram, I think I can see the two sphere sources.  Root datafile and raw
sinogram could be downloaded through the following link.
https://drive.google.com/open?id=0B0vKwnYlHgr1LWpiclpnTUFZbUE

I converted the GATE geometry to the .geom file ("GATE_PET.geom" as
attached) and then converted root datafile to CASToR datafile with -t
option. ("aq4.log", "aq4_CstrProj.Cdh" and "aq4_CstrProj.Cdf" as attached)

Q1: It seems that the -t option only converts true unscattered events. Is
it able to convert true unscattered and scattered events (no random)?

Q2: In aq4_CstrProj.Cdh, the maximum ring difference is -1. Since the
simulated PET has 52 detector rings, I think the maximum ring difference
should be 51. I would like to know why is it -1?

Then I use the following command to perform the reconstruction.

castor-recon -df aq4_CstrProj.Cdh -dout recon_aq4 -it 3:8 -dim 400,400,109
-fov 780,780,218

Q3: The reconstructed images are not right. Is there any idea how I can
solve it?
https://drive.google.com/open?id=0B0vKwnYlHgr1V3F2Q2JTLTlyc00

Thank you very much and I'm looking forward to hearing from you.

Your sincerely,
Ying-Yu Chen
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