[gate-users] Supported Scanners

[Christian MOREL]

Dear Theodore,

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.

Regards,

Christian Morel

Le jeudi, 25 nov 2004, à 10:42 Europe/Zurich, Claude Comtat a écrit :

> Mutanga Theodore wrote:
>
>>> 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.
>
> Basically, you take an existing system, like the ecat or the 
> cylindricalPET, copy and modify it in order to implement your 
> favourite output format (this is what I did for the ecat system; I 
> copied the cylindricalPET system and modified it). I can give you the 
> name of the files you need to copy and modify. The difficult part is 
> to know exactly the format you want to implement, and I'm not sure it 
> is the case for the GE scanners.
>
>>> 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.....
>>
>
>
> Basically, you have to program in C++. Again, we can provide you with 
> an existing code as an illustration. But it looks like Sadek already 
> did that job.
>
>>> 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 ?
>
>
> You can contact Christian Morel (Christian.Morel at epfl.ch) and ask him 
> if the lmf can handle the ST or LS geometry. Note that STIR will not 
> write the data in the native GE format but uses Interfile. Then, you 
> will be able to reconstruct the Interfile sinogram with STIR.
>
> Rgds,
>
>
> Claude
>
>
>
> -- 
> 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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>

__________________
Christian MOREL, PD, PhD
LPHE-IPEP
EPFL
CH-1015 Lausanne
Switzerland

phone: +41 21 693 04 76
fax: +41 21 693 04 77
mobile: +41 79 292 80 70
email: christian.morel at epfl.ch
web: http://www-lphe.epfl.ch/~PET/