[gate-users] Binning sinograms by scatter?

[Claude Comtat]

Please see Christian Morel email:

 > The LMF version that is released on the web site does not allow to
 > handle the ST or LS geometry. It was originally developed for the
 > ClearPET listmode data format that needs only 16 bits to encode the
 >  position of the detectors. However, a new release of the LMF
 > format is in preparation to extend the position encoding to 32 or
 > 64 bits. Then it will be possible to encode larger designs. This
 > update is still under test and development in Lausanne and Orsay
 > and we will make it available as soon as possible, though this will
 >  not be possible before 2005.

For now, the default listmode format is root. Note that you can 
deactivate some outputs in root to save space.

Regard,

Claude

evander at physics.ubc.ca wrote:

 > Thanks, Claude. I appreciate the fast response. I think modifing the
 >  source code may be the simplest way. I would like to do high
 > statistics studies and the root files will become too large too
 > quickly. Are there any plans to generalize the different outputs
 > (especially LMF) so that they are not so linked to the detector
 > geometry? I imagine list mode data would be useful to many GATE
 > users. Best Regards, Eric
 >
 > No, there is no option in the sinogram output of the ecat system to 
select
 >  the events according to their interaction history. To do this, you
 >  have several possibilities:
 >
 > 1) as you mentionned, use the LMF output. However, the current
 > version of LMF was designed for the clearPET scanner and can handle
 >  only a limited set of geometries (please refer to Ch. Morel email
 > from yesterday).
 >
 > 2) you can use the root output, where this information is stored, and 
write a root program (not very complicated) to select the events and
 > write the sinogram. Mightbe somebody has already such a routine.
 >
 > 3) you can always modify the source code of GATE (src/GateToSinogram.cc,
 > routine RecordEndOfEvent).
 >
 > Rgds,
 >
 > Claude
 >
 > evander at physics.ubc.ca wrote:
 >
 >
 >>Hi,
 >>I'm a new GATE user and I was wondering if there was an option to use the
 >>ecat system geometry and sinogram output to bin the data based on the
 >>interaction history of the photons. For example, it would be nice to have
 >>a separate sinogram for the different orders of Compton scatter that 
occur
 >>in the phantom and/or in the detector. Alternatively if there were a way
 >>to produce LMF data for the ecat system geometry I could just bin them
 >>into sinograms myself.
 >>Thanks,
 >>Eric
 >>_______________________________________________
 >>gate-users mailing list
 >>gate-users at lphe1pet1.epfl.ch
 >>http://lphe1pet1.epfl.ch/mailman/listinfo/gate-users
 >>
 >>
 >>
 >>
 >
 >


-- 
Claude Comtat					comtat at ieee.org
Image acquisition and processing group		tel: +33 1 69 86 77 02
Frédéric Joliot Hospital Facility		fax: +33 1 69 86 77 49
French Atomic Energy Commission 		www-dsv.cea.fr/shfj

 > > write a root program (not very complicated) to select the events
 > and write the sinogram. Mightbe somebody has already such a routine.
 >
 > 3) you can always modify the source code of GATE
 > (src/GateToSinogram.cc, routine RecordEndOfEvent).
 >
 > Rgds,
 >
 > Claude
 >
 > evander at physics.ubc.ca wrote:
 >
 >
 >> Hi, I'm a new GATE user and I was wondering if there was an option
 >>  to use the ecat system geometry and sinogram output to bin the
 >> data based on the interaction history of the photons. For
 >> example, it would be nice to have a separate sinogram for the
 >> different orders of Compton scatter that occur in the phantom
 >> and/or in the detector. Alternatively if there were a way to
 >> produce LMF data for the ecat system geometry I could just bin
 >> them into sinograms myself. Thanks, Eric 
_______________________________________________
 >>

 >> gate-users mailing list gate-users at lphe1pet1.epfl.ch 
http://lphe1pet1.epfl.ch/mailman/listinfo/gate-users
 >>

 >>
 >>
 >>
 >>
 >
 >


-- 
Claude Comtat					comtat at ieee.org
Image acquisition and processing group		tel: +33 1 69 86 77 02
Frédéric Joliot Hospital Facility		fax: +33 1 69 86 77 49
French Atomic Energy Commission 		www-dsv.cea.fr/shfj