[Gate-users] No coincidences when using generic repeater in PET

[Zhengzhi Liu]

Dear Han Gyu and Christian,

Thanks, Han Gyu very much for your quick response and Christian great
contribution. I just installed the patch and the installation went well,
then I reboot my vGATE8.2 virtual machine. However, I still didn't get any
coincidence event registered when using genericRepeater in a
*cylindricalPET* system in my simple test.

Here is what I did:
I replaced the ring repeater with genericRepeater in benchPET
<https://github.com/OpenGATE/Gate/blob/develop/benchmarks/benchPET/camera.mac>,
reduced
the number of detector heads to 2 and set minSectorDifference to 1. Then I
did a visualization check. Finally, I got no coincidence recorded. Then I
switched back to ring repeater (which is the only change for this step), I
did collect many coincidence events. So it looks the patch doesn't fix the
problem in *cylindricalPET*.

Has anyone ever got the patch work in a cylindricalPET system?

Thank you so much, dear GATE community members.
Sincere greetings,

Zhengzhi



On Mon, Jan 27, 2020 at 8:27 PM 강한규 <lovehangulp at naver.com> wrote:

> Dear Zhengzhi, and Christian,
>
>
>
> As you already know, Christian (pommranz at astro.uni-tuebingen.de) shared
> the git patch file to solve the coincidence output issue.
>
>
> http://lists.opengatecollaboration.org/pipermail/gate-users/2019-February/010729.html
>
>
>
> I have also *succeeded *in acquiring coincidence output using *generic
> repeater* in* PETscanner *system with the patch file shared by Christian.
>
> Below is an example of the detector arrangement with genericRepeater.
>
> Thanks Christian for your great contribution~!
>
>
>
>
>
> Here is a brief manual how to apply the git patch in GATEv8.2.
>
>
> ===========================================================================================================================
> *Problem*: *No coincidence* in the "*PETscanner*" when *genericRepeater *was
> used.
> *Solution*: *Modify the GATEv8.2 source code* using a *git patch file*
>  and *re-compile*.
>
> GATE mailing list (Christian Pommranz <pommranz at astro.uni-tuebingen.de>)
>
> http://lists.opengatecollaboration.org/pipermail/gate-users/2019-February/010729.html
>
> *STEP1*> Download the git patch file in the mailing list.
> Filename: *coincidences_for_generic_repeater.patch*
>
> *STEP2*> Apply the git patch file.
> >cd /home/kanghg2/program/Gate-8.2
> >git apply --ignore-space-change --ignore-whitespace
> coincidences_for_generic_repeater.patch
>
> *STEP3*> Re-compile GATEv8.2
> >cd /home/kanghg2/program/Gate-8.2-build
> >ccmake ../Gate-8.2
> [c] configure
> [g] generate
>
> >make
>
> *STEP4*> Run the GATE PETscanner with genericRepeater.
> *Now coincidence output will be generated!*
>
>
> ===========================================================================================================================
>
>
>
> Hopefully, you will be able to obtain coincidence output with
> genericRepeater.
>
>
> Best regards,
>
>
>
> Han Gyu Kang, Ph.D.
>
>
>
> Imaging Physics Group, NIRS-QST, Japan.
>
> -----Original Message-----
> *From:* "Zhengzhi Liu"<zliu36 at stanford.edu>
> *To:* <gate-users at lists.opengatecollaboration.org>;
> *Cc:*
> *Sent:* 2020-01-28 (화) 12:47:21 (GMT+09:00)
> *Subject:* [Gate-users] No coincidences when using generic repeater in PET
>
> Dear GATE community members,
>
> I looked at previous GATE correspondence
> <http://lists.opengatecollaboration.org/pipermail/gate-users/2019-February/010729.html>,
> it looks there has been an issue with coincidence sorter when using along
> with generic repeater. I am using vGATE8.2, it still exists.
>
> Has anyone ever succeeded in getting them to work together?
>
> Thanks a lot for your advice.
> Sincerely,
>
> Zhengzhi
>
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