[Gate-users] Missing scatter in sensitive detector?

[Allison Craig]

Thanks.  Just to send an update on this, the suggestion from Emlyn did the trick.  I ran the old Physics code and disabled atomic deexcitation and this allowed me to be able to isolate those photons which had not undergone scatter.

Allison

From: Emlyn Price [mailto:emlyn.price at postgrad.manchester.ac.uk]
Sent: 13 November 2018 11:51
To: Allison Craig
Cc: gate-users at lists.opengatecollaboration.org
Subject: Re: [Gate-users] Missing scatter in sensitive detector?


Hi,



I have had problems with scatter recording not behaving properly when atomic deexcitation is enabled as a physics process.



Emlyn Price

________________________________
From: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> on behalf of Uwe.Pietrzyk <Uwe.Pietrzyk at web.de>
Sent: 09 November 2018 17:18:09
To: Allison Craig
Cc: gate-users at lists.opengatecollaboration.org
Subject: Re: [Gate-users] Missing scatter in sensitive detector?

Hello Alison Craig,

I would like to suggest having a look at the Benchmark
Gamma-Camera, especially the analysis file ".C" which
reads the ROOT-File and provides some statistics about
the different types of scatter. See also attached file, I found
on my system.

All the best and kind regards,

Uwe Pietrzyk
---------------------------------------
Prof. Dr. Uwe Pietrzyk
Diplom-Physiker
Am Anger 18
50374 Erftstadt
Tel: +49-2235-922038
Fax: +49-2235-922039
Mobil: +49-172-213-2155
eMail: Uwe.Pietrzyk at web.de<mailto:Uwe.Pietrzyk at web.de>
---------------------------------------




On 9. Nov 2018, at 16:02, Allison Craig <Allison.Craig at icr.ac.uk<mailto:Allison.Craig at icr.ac.uk>> wrote:

Hi all

I have a model of a SPECT system, I have run an acquisition with a Tc99m line source within a cylindrical phantom and am trying to isolate the scattered from the non-scattered photons from within the root file.

I have removed all Compton and Rayleigh scatter within the phantomSD and crystal and yet my spectrum is still showing some scattered photons:
<image001.jpg>

I have set my sensitive detectors as:

/gate/Phantom/attachPhantomSD
/gate/compartment/attachPhantomSD
/gate/shielding/attachPhantomSD
/gate/SPECThead/attachPhantomSD
/gate/collimator/attachPhantomSD
/gate/casing/attachPhantomSD

And my root output as:

/gate/output/root/enable
/gate/output/root/setFileName Test1
/gate/output/root/setRootSinglesAdderFlag 1
/gate/output/root/setRootSinglesBlurringFlag 1
/gate/output/root/setRootSinglesSpblurringFlag 1
/gate/output/root/setRootSinglesThresholderFlag 1
/gate/output/root/setRootSinglesUpholderFlag 1

Can anyone help?  I am unsure if I am missing a sensitive detector definition somewhere?

Thanks

Allison

Allison Craig
Principal Radioisotope Physicist
Joint Department of Physics
The Royal Marsden NHSFT
Sutton PhD Office: 0208 661 3086
allison.craig at icr.ac.uk<mailto:allison.craig at icr.ac.uk>


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