[Gate-users] Z position

[venialgo_e]

Thanks a Lot!!, Now is working commenting out

# /gate/world/daughters/insert 3axes

Thanks again.


     Regards,

     Esteban Venialgo


"Chen, Yu" <Yu.Chen at umassmed.edu> ha escrito:

> When there are nothing on root file for 1000 events, it must be   
> something wrong.
>
> I commented out
>
> /gate/world/daughters/insert 3axes
>
> then it runs without problem.
>
> Generated 1000 bg* 100s = 10^4 events, obtained ~5x10^3 singles in   
> 2.5 cm NaI.
> You can estimate to see if it is correct using known attenuation coefficient.
>
> Among them are there half with energy > 600 keV but still occured   
> Compton scattering.
>
> Those without Compton scatter (6426) lie a perfect exponential   
> distribution (see attached pdf).
>
> Yu Chen, Ph.D.
> University of Massachusetts Medical School
> Division of Nuclear Medicine
> 55 Lake Avenue North
> Worcester, MA 01655-0243
> Phone:  (508) 856-6123
> Fax:    (508) 856-4572
>
>
>
> -----Original Message-----
> From: venialgo_e [mailto:venialgo_e at secyt.frba.utn.edu.ar]
> Sent: Wed 2/20/2008 8:47 AM
> To: Chen, Yu
> Subject: RE: [Gate-users] Z position
>
> I attached the file 1000bq.root and 1000bq.mac .For 1000 bq  and 1
> second there aren't counts in the detector.
>
>     bye,
>
>     Esteban Venialgo
>
>
> "Chen, Yu" <Yu.Chen at umassmed.edu> ha escrito:
>
>> I strongly suspect you were plotting "hit" not "singles".
>>
>> The following is my message last time to you:
>>
>>> Are you sure you plotted *Singles*?
>>> From you macro, we can't see any digitizing module used.
>>
>>> You generated 20000*3 photons but have more than 60000 entries.
>>> It may explain some if what you actually plotted is hit (step)
>>> point position.
>>
>>
>> Put
>> /gate/output/root/setRootSinglesFlag 1
>> in your mac
>> and no energy window needed
>>
>> Run 1000 bq and 1 sec
>> send your root file to me.
>>
>> Yu Chen, Ph.D.
>> University of Massachusetts Medical School
>> Division of Nuclear Medicine
>> 55 Lake Avenue North
>> Worcester, MA 01655-0243
>> Phone:  (508) 856-6123
>> Fax:    (508) 856-4572
>>
>>
>>
>> -----Original Message-----
>> From: gate-users-bounces at lists.healthgrid.org on behalf of venialgo_e
>> Sent: Mon 2/18/2008 12:34 PM
>> To: Chen, Yu; gate-users at lists.healthgrid.org
>> Subject: RE: [Gate-users] Z position
>>
>> Yes, I don't have any digitalizer modules, because I have done Matlab
>> scripts in the way to have more freedom to select scatter and
>> photoelectric interactions or both, calculate position using weighted
>> average for position, and apply energy windows, etc.
>>
>> Anyway I connect an adder and a energy window to system and...
>>
>> In case 1 there are two peaks of counts in the crystal's top face, if
>> the digitalizer is only an adder. The name of the files are
>> case1_wo_window.gif and case1_wo_window.mac    .But if the digitalizer
>> has an adder and energy window, so there is a maximum of counts in 18
>> mm approx.   .The files for that case are case1digitalizer.gif and
>> case1digitalizer.mac.
>>
>> For case 2, is the same than before. There are counts only in second
>> half of the crystal with an adder and energy window. The files are
>> case2digitalizer.gif and case2digitalizer.mac.
>>
>> And, In case 3, There is a maximum of counts in 10 mm approx, with and
>> adder and energy window. The files are case3digitalizer.gif and
>> case3digitalizer.mac .
>>
>>
>>
>> I can't understand the different shapes of Z position. I expected and
>> exponential decreasing shape.
>>
>>
>>
>>      	Thanks a lot for your support.
>>      	Esteban Venialgo.
>>
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>>
>
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