XCAT Simulation

Usage Questions
1

Hi everyone, I was wondering if anyone could help me.

I am running an XCAT phantom（128 ×128 ×128 pixel width = 0.300 (cm/pixel)
slice width = 0.1500 (cm/pixel)） SPECT simulation in SIMIND.

The attenuation，projection and scattering figure look right, but the reconstruction quality should be a bit poor.

image
image1148×564 158 KB

projection
image
image1164×566 71.2 KB

image
image1030×794 22 KB

attenuation
image
image1010×796 79.3 KB

reconstruction

I suspect there is a problem with .smc parameter Settings?
Who can help me get to the root of the problem?

If anyone has any suggestions, it would be greatly appreciated.
Cheng

2

Hi Cheng,

This is probably due to SIMIND 8.0 updating the interfile format to express collimator dimensions in mm instead of cm. If you change the units at the bottom of the h00 files, this bug should be fixed. I’ll also account for this in the newest version of PyTomography.

3

Dear Luke

In fact, I have changed the parameters of the.h00 file to make the units uniform

image
image1040×774 68.8 KB

I feel like maybe it’s a setup error? Or who can give me a correct SPECT parameter?

Thanks
Cheng