[Gate-users] Gate output ECAT7 to STIR

[Kris Thielemans]

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
> 
> 
> 
>