[gate-users] Supported Scanners

[Claude Comtat]

Dear Theo,

indeed, there is no problem in simulating the geometry of an Advance 
scanner with GATE. An other problem is the sinogram output format. The 
ECAT system was designed to allow an ECAT7 formatted output sinogram 
that mimics the native format of the ECAT scanners. If you want to 
replicate the Advance sinogram file format, you will have to code it 
yourself. For this, you have different possibilities:

1) you create a new system inside GATE and implement the characteristics 
of the Advance file format. It is not too complicated; you'll need to 
duplicate the ecat system and modify it according to your needs

2) you can use the sinogram output --- and not the ecat7 output --- of 
the ECAT system (the .ima and .dim files), as you mentioned, and write 
your own code to rewrite it in the Advance format (there is no program 
so far that can be used to read these files). This sinogram output is a 
raw format, with one 2D sinogram per crystal ring pair.

3) you can write your own root macro to convert the root output into an 
Advance formatted sinogram.

4) you can use the CylindricalPET system with an LMF output, and use 
stir to convert it into sinogram. However, I do not know if the current 
version of LMF can handle the Advance geometry.

Hope this helps,

Claude

Mutanga Theodore wrote:

> Thanks for clarifying that Ross, at
>  least now I know the limitations of my design. What about using the .ima
> and .dim files from the sinogram outputs? what can be used to read those
> ? Given that one is only interested in the basic parameters of the DST
> scanner ,- NEC , resolution and sensitivity whicih system will be best
> for the DST then ? I was hoping I could at least get some form of
> reconstructed image of a point source so that I could calculate the
> spatial resolution.
> 
> In the example of the Hoffman phantom , what was used to produce the
> images I saw on the documentation website ?
> 
> Cheers
> Theo
> 
>  Hi Theodore,
> 
>>Depending upon the level of detail in your model the ECAT system may be
>>fine, however if you need more detail and your system is a cylindrical
>>series of blocks cylindricalPET may be better.  In either case GATE will
>>fairly accurately simulate the physics with in the geometry that you
>>have specified.  On the other hand, the output for both systems is
>>somewhat limited and to get it into a format that is useful may be quite
>>difficult.  At this point very few formats are available in GATE, but
>>GATE is still very young.
>>
>>ross
>>
>>-----Original Message-----
>>From: gate-users-bounces at lphe1pet1.epfl.ch
>>[mailto:gate-users-bounces at lphe1pet1.epfl.ch] On Behalf Of Mutanga
>>Theodore
>>Sent: Wednesday, November 24, 2004 6:55 AM
>>To: gate-users at lphe1pet1.epfl.ch
>>Subject: [gate-users] Supported Scanners
>>
>>
>>Greetings ,
>>
>>I want to pose this question to all the gate developers, was I wrong to
>>try to model the GE Discovery ST using the ecat system ? From what I
>>have come to understand it seems I cannot use GATE to model the DST,
>>even if using the ecat is correct it means I cannot get a valid sinogram
>>output for the DST ...?
>>
>>Could someone please clarify me, if using the ecat system for the DST is
>>wrong how can I go about modelling the DST with GATE ?
>>
>>Kind regards
>>Theodore
>>_______________________________________________
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>>
>>
>>
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>>
> 
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> 
> 


-- 
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