[Gate-users] Gate output ECAT7 to STIR

[tao sun]

Hi Kris,

Now I can generate and display correctly in STIR. And also reconstructed
image seems ok (line source). It took long time to run simulation in Gate,
in order to increase the acqusition time. I guess I should dig more Gate
then.

Thanks,
Sun Tao

2012/5/21 Kris Thielemans <kris.f.thielemans at gmail.com>

>
> Hi Tao
> Always reply to the list.
>
> >
> > I am newbie to Gate and it may seem to take me more time to fix.
> >
> > Sinogram information as below (STIR 2.1)
> >
> > Maximum= 256
> >
> > Minimum= 0
> >
> > Total counts= 11264
> >
> > after that I extract_segment to certain inerfile. I open in ImageJ and it
> seems
> > the image is binary, only 0 and 1.
> >
>
> If it's binary, it could be that your data is just very very noisy and that
> you have to run more counts. (Ideally the sinogram values would then be
> either 0 or 1, but maybe there's a scale factor somewhere)
>
> > Yes, it probably is the Gate simualtion problem, but surprisingly someone
> > seems succeed run the ecat example and display in STIR.
> >
>
> Why is that "surprising"? :-)
>
> Kris
> >
> >
> >
> > 2012/5/21 Kris Thielemans <kris.f.thielemans at gmail.com>
> >
> >
> >       Hi
> >
> >       >
> >       > I saw some replies on the Gate list about Gate sinogram output to
> > STIR. I
> >       > am using  GATE example PET_Ecat_system.mac which outputs the
> > ECAT7
> >       > sinogram.
> >       > However, when I generated the headers and display in the SITR, it
> > was all
> >       > black. I am wondering who succeeded display the sinograms and
> > what
> >       > parameters he changed in the header?
> >       >
> >
> >
> >       It's unlikely that you need to change headers for the display to
> work.
> > If
> >       you simulated a non-CTI scanner, you will likely have to update the
> > geometry
> >       fields, but that doesn't change anything about the actual values in
> > the
> >       sinogram.
> >
> >       Best to use " list_projdata_info -all yourfile.S" (or
> "manip_projdata
> >       yourfile.S" if you don't have STIR 2.2) to see what the values are
> in
> > the
> >       sinogram. If they're zero, I suspect something went wrong in your
> >       simulation. Also check GATE log files.
> >
> >
> >       Kris Thielemans
> >       Senior Research Fellow at King's College London
> >       Honorary Lecturer at Imperial College London
> >       Founder of Algorithms and Software Consulting Ltd
> >
> >
> >
> >
>
>
>