[Gate-users] How to simulate Lu-176 in LSO crystal

[Albert Grace Lieu]

Dear Maxime,

Thank you so much for taking your precious time to help me and thanks for
pointing me to the Noise module
<https://opengate.readthedocs.io/en/latest/digitizer_and_detector_modeling.html#noise>.
I did read the section carefully. My concern is how accurately this method
can simulate Lu-176 decay. What this module does is adding an energy to a
detected single photon. Thus it may not create new singles from Lu176
decay. Do I understand it correctly?

My idea was to add a Lu176 ion source to each LSO crystal. Theoretically,
this may give the most accurate simulation. However, I don't know where to
find the names of these crystals. As to the complexity, I think I can use
Python to write source mac quickly if I have to repeat and modify it for
thousands of times. I looked at names present in Scene tree and .wrl files,
such as Crystal_phys[0], Crystal_phys, and Crystal_phys.0. None of them
were recognized by GATE. I got the following error message:

GateObjectStore.cc <http://gateobjectstore.cc/> (l.110): The volume
'Crystal_phys.34' cannot be found in the list of volumes. Abort.
Here is the list of available volumes :
 Al_sleeve Al_sleeve_p1 C_sleeve Crystal End_shield NEMA_LP PETscanner
Pb_shielding Phan_holder Subblock Subblockin block blockIn head module
moduleIn world
Attached to:        'digitizer'


It looks like the repeated crystal volumes do not show up in the list of
available volumes.  I am curious whether any GATE user knows how to add a
source to repeated volumes?

Thank you very much.
Have a wonderful day!


Zhengzhi





On Thu, Jun 11, 2020 at 7:03 AM Maxime Toussaint <
Maxime.Toussaint at usherbrooke.ca> wrote:

> Greetings,
>
> I have never used it but I have heard one of my colleague say that this
> could be done with the *Noise* module of the *Digitizer*.
>
> About your approach, I would guess that the only detector named "Crystal"
> in your system would be the first one created, the one that is repeated.
> The ones created by the repeater most likely have an automatic generated
> name but I have no idea what it is. Even if you had the name of each one,
> you would need to add a source to each one which would be complex (I
> think?).
>
> Bests,
> Maxime Toussaint
>
>
> ------------------------------
> *De :* Gate-users <gate-users-bounces at lists.opengatecollaboration.org> de
> la part de Albert Grace Lieu <albertnew2018 at gmail.com>
> *Envoyé :* 11 juin 2020 01:09
> *À :* gate-users <gate-users at lists.opengatecollaboration.org>
> *Cc :* Peter Olcott <polcott at reflexion.com>
> *Objet :* [Gate-users] How to simulate Lu-176 in LSO crystal
>
> Dear Gate users and developers,
>
> There are a couple of papers [1
> <https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Faapm.onlinelibrary.wiley.com%2Fdoi%2Fabs%2F10.1118%2F1.4824694&data=02%7C01%7Cmaxime.toussaint%40usherbrooke.ca%7C5a63bc4be9ae4335ee9008d80dc5af21%7C3a5a8744593545f99423b32c3a5de082%7C0%7C0%7C637274490000985547&sdata=z25mHQ3vAeaiCVrSk%2BHuajOruDFHzil61wO6v5uptPE%3D&reserved=0>
> ,2
> <https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fieeexplore.ieee.org%2Fdocument%2F5751205&data=02%7C01%7Cmaxime.toussaint%40usherbrooke.ca%7C5a63bc4be9ae4335ee9008d80dc5af21%7C3a5a8744593545f99423b32c3a5de082%7C0%7C0%7C637274490000995545&sdata=fGxaotiPFDWbMjYO9uyoQVV%2BgIhTi%2BKLBvaHH3aau6k%3D&reserved=0>]
> addressing the importance of adding the simulation of Lu-176 in Lutetium
> based crystal in GATE simulation. I try to do this to my simulated PET
> system that has thousands of pieces of crystals (created with linear and
> cubic array repeater). My general idea of implementing this is to create a
> Lu176 ion source and then attach it to my crystals. However,  when I do:
>
> /gate/source/Lu176/attachTo Crystal
>
> the Lu176 is only attached to a single piece of crystal (which can be
> visualized with /gate/source/Lu176/visualize 1000 red 3).  Has anyone
> implemented this before? Could you please share your thoughts?
>
> Thanks a lot. Greatly appreciated.
>
> Zhengzhi
>
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