[Gate-users] Gate-users Digest, Vol 150, Issue 14

[Allison Craig]

Thanks Uwe

I shall have a look at that file.  I did base my .C file on the SPECT benchmark example, however I still appear to have scatter present when I should not.  I have not split my Compton scatter up into different orders but tried to output for zero scatter:

if (septalNb == 0 && comptonCrystal == 0 && comptonPhantom == 0 &&  RayleighCrystal == 0))

and yet there is still scatter present.


Allison 



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Today's Topics:

   1. Re: Missing scatter in sensitive detector? (Uwe.Pietrzyk)


----------------------------------------------------------------------

Message: 1
Date: Fri, 9 Nov 2018 18:18:09 +0100
From: "Uwe.Pietrzyk" <Uwe.Pietrzyk at web.de>
To: Allison Craig <Allison.Craig at icr.ac.uk>
Cc: "gate-users at lists.opengatecollaboration.org"
	<gate-users at lists.opengatecollaboration.org>
Subject: Re: [Gate-users] Missing scatter in sensitive detector?
Message-ID: <D2799DEA-45FB-4DE6-A601-4830151B0263 at web.de>
Content-Type: text/plain; charset="utf-8"

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
---------------------------------------





> On 9. Nov 2018, at 16:02, Allison Craig <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>
>  
> 
> The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company Limited by Guarantee, Registered in England under Company No. 534147 with its Registered Office at 123 Old Brompton Road, London SW7 3RP.
> 
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