[gate-users] Supported Scanners

[Mutanga Theodore]

> 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:

thanks very much Claude

> 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

I am interested in this option but it doesnt seem straightforward to me
axcept I get some help from you or someone else.
>
> 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.

This looks similar to what Sadek has done with the discovery LS , if he
can give me some more clues, Ill be grateful

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

 I dont knwo if I can manage with the root programming.....

> 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.

This is what I am planning to embark on for the moment, but since you are
not sure about the lmf being able to handle the Discovery ST , LS geometry
I don't know if I'll be doing it in vain.. Who can I ask about the lmf
support for Discovery LS and ST ?

We were planning to get in contact with GE to find out about the
arrangement of the projection planes, but I don't know if my supervisor
has succeeded in getting in contact with them.

Ill keep looking and I appreciate all the help from the GATE team .

Regards
Theo

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