[gate-users] superimposed sources

[Christian MOREL]

Dear Theodore,

The PET and SPECT benchmarks were developed for this purpose. Please  
look at the manual, run the benchmarks and compare the results with the  
results presented in the documentation.

Best regards,

Christian Morel

Le mercredi, 6 oct 2004, à 16:31 Europe/Zurich, Mutanga Theodore a  
écrit :

> Hi Corinne,
> I am not answering your question but asking for some help with other  
> GATE
> tutorials, I would be grateful if you can give me as much examples to  
> play
> around with. I am to develop a tool to simulate PET images using Monte
> Carlo, so I need alot of help with that from you guys who have already
> been using GATE. Can someone help me with any information on that ?
> Also how can I check the integrity of my GATE installation, to make  
> sure
> the date and stuff are correct ?
>
>
> Regards
>
> Mutanga Theodore.
>
>
>
>
>
>> Hi all,
>>
>> I know the question has already been asked but I can't find the answer
>> in GATE-Talk, so I ask it again... O:-)
>> I simulated 6 hot spheres (R=1cm) in a warm cylinder (D=20cm,  
>> H=70cm). I
>> want a contrast of 5:1. So I did the following to define the activity  
>> I
>> wanted in each of the volumes:
>> for the cylinder: 214.6MBq
>> for each sphere: (5-1)x(214.6MBq/(pix10x10x70))x(4xpix1x1x1/3), eg.
>> (5-1)x(Cylinder Activity / Cylinder Volume) x (Sphere Volume)
>> I used (5-1) and not 5 assuming there will be the annihilations from  
>> the
>> cylinder AND from the spheres at the sphere location.
>>
>> The problem is that I can't recover that contrast in the reconstructed
>> data. Can someone tell me if I did something wrong in the activity
>> setting?
>>
>> Thanks a lot,
>>
>> -- Corinne
>>
>> ---------------------------------------------------------------------- 
>> --
>> Corinne J. Groiselle, PhD
>> Research instructor
>>
>> Division of Nuclear Medicine / Department of Radiology
>> University of Massachusetts Medical School
>> 55 Lake Avenue North
>> Worcester, MA 01655
>> USA
>>
>> _phone_: (508)-856-6123 - fax: (508)-856-4572
>> _e-mail_: Corinne.Groiselle at umassmed.edu
>> _professional homepage_: http://users.umassmed.edu/corinne.groiselle
>> _personal homepage_: http://corinne.groiselle.free.fr
>>
>>
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>>
>
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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/