[Gate-users] [Stir-users] attenuation correction with Gate simulated CT's

[Kris Thielemans]

Hi Thomas

> -----Original Message-----
> From: stir-users-bounces at lists.sourceforge.net [mailto:stir-users-
> bounces at lists.sourceforge.net] On Behalf Of Layer Thomas
> Sent: 12 March 2012 02:24
> To: stir-users at lists.sourceforge.net
> Subject: [Stir-users] attenuation correction with Gate simulated CT's
> 
> dear Stir (-Gate) users!
> 
> i want to do attenuation correction (during OSMAPOSL) to PET simulations
> with CT data, both simulated with gate.
> my problem reading the CT is that gate outputs just 2-dimensional
> projections, one per angle of acquisition (timeslice) which are stored as
> binary matrices of float numbers.
> i know that the ProjData objects to be read in by BinNormalisation need to
> have same dimensions as my PET sinograms so how can i use the tools
> provided in "...STIR/debug/utilities" to get attenuation data for usage
with
> OSMAPOSL?
> 

I also saw your question on the GATE list. I wonder if you're not confused.
It looks like GATE is doing a CT simulation, so you'll have "CT data". Those
would need to be reconstructed then. That's a rather large topic in itself.
If a 2D only without moving the bed, it's probably doable with STIR, but
you're largely on your own then I guess. 

What STIR will need is an image of mu-values, which somehow you've input
into GATE anyway (as material). No need to go through a CT simulation,
unless you want to check effects of using CT for attenuation correction of
PET...

Hope this helps

Kris