[gate-users] Re: [opengate-sc] USE G4LECS in GATE

[Christian MOREL]

Dear Li Han,

Please, use the gate-users mailing list to send your questions. You 
will notice that this mailing list is quite active ;-)

Sincerely,

Christian Morel

Le vendredi, 28 jan 2005, à 17:21 Europe/Zurich, Li HAN a écrit :

> Dear Sir or Madam,
>
> Thanks for your solution for Compton Camera on GATE. Today, I also 
> have another question
> The Doppler broading is very important for Compton Scattered Camera.
>
> Clearly, the package Geant4-low energy do not support it. I found 
> another package G4LECS
> http://public.lanl.gov/mkippen/actsim/g4lecs/
>
> I do not kown whether I could use G4LECS package directly in GATE or 
> have to be modify the source code
> of GATE, which classes I need change to use this package
>
> Thanks
>
> Li HAN
>
>
>
>> Bonjour Li-Han,
>>    As far as I understood your problem, you need to have two different
>> levels of sensitive volume where you can store hits informations as
>> energy, time, positions. With the "scanner" system, you have 5 levels
>> available, with no geometry constraints for the shape, to define your
>> detector. Two levels can be taken for your two types of detector and 
>> if
>> they are declared as "sensitive detector" and "attach" to a level of 
>> the
>> system, your informations will be saved for your Compton 
>> reconstruction
>> in a further analysis. A constraint which can be a problem is that a
>> level volume has to be fully enclosed in the upper level volume. If 
>> this
>> is a problem for modelling the two levels of your detectors (Si and
>> crystal), solutions can be found (for modelling phoswish module in PET
>> scanner, 2 levels of sensitive detector which are not included in 
>> their
>> geometry exist, so it can be done for the general case of the 
>> "scanner"
>> system of Gate).
>> The only output format available for such a system are ASCII and ROOT
>> format, there is no Interfile format with such system.
>> I hope that GATE will be appropriate for your modelisation. I don't 
>> know
>> if I was clear enough with my informations, so don't hesitate to ask
>> more questions about your simulation.
>>
>> Bye
>> Sophie
>>
>> Ps: you should send your mail to the user gate mailing list where you
>> will reach more people....
>> gate-users at lphe1pet1.epfl.ch
>>
>> ----------------------------
>> Sophie Kerhoas-Cavata
>> Service de Physique Nucl閍ire
>> CEA/DSM/DAPNIA/SPHN
>> 91 191 Gif/Yvette
>> skerhoas at cea.fr
>>
>>
>> -----Message d'origine-----
>> De? opengate-sc-bounces at lphe1pet1.epfl.ch
>> [mailto:opengate-sc-bounces at lphe1pet1.epfl.ch] De la part de Li HAN
>> Envoy闋: lundi 24 janvier 2005 20:27
>> 罓: opengate-sc
>> Cc? lhan
>> Objet? [opengate-sc] simulation of Compton based SPECT on GATE
>>
>> Dear Sir or Madam,
>>
>> I have a question about simulating Compton based SPECT. I would like 
>> use
>> GATE, however I am afrad whether it has strong capability to do this
>> job.
>>
>> The basic principle of Compton based SPECT,which does not have lead
>> collimater, is the photon hit on the first detector,such as silicon
>> dector, and then it hit on the sencond detector after compton
>> scattering. therefore, for the C-SPECT, I need record the position and
>> energy on both detector to determine the original photon location.
>>
>> After I read the manual of GATE, I found there is not special SYSTEM 
>> for
>> the two detectors, and the output do not support to record the
>> information for the two detectors.
>>
>> I am not a expert for GATE, therefor I send email to assistance. I 
>> hope
>> the current version of GATE could make this simulation, or I can 
>> modify
>> the source code of GATE under your guide
>>
>> Sincerely
>>
>> Li HAN
>>
>>
>> _______________________________________________
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>> opengate-sc at lphe1pet1.epfl.ch
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>
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__________________
Christian MOREL, PD, PhD
LPHE-IPEP
EPFL
CH-1015 Lausanne
Switzerland

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