[Gate-users] Gate-users Digest, Vol 146, Issue 2

[Emmanuel Marfo]

Dear GATE users,

Please, I followed Maikol recommendation and I think it helped improve my STL localization. Even though the STL file was not completely in the centre of the geometry. Now I can get dose readings. Please. find attached file showing some values recorded by the dose actor. Thanks very for your help.

Best regards,

Emmanuel ,

Emmanuel Marfo

Student

University of Otago

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Subject: Gate-users Digest, Vol 146, Issue 2

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Today's Topics:

   1. Re: Dose actor shows zero valuesand STL file not in the
      center of defined geometry (Maikol Salas Ramirez)


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

Message: 1
Date: Mon, 2 Jul 2018 15:59:27 +0200
From: Maikol Salas Ramirez <mmsalas at gmail.com>
To: Emmanuel Marfo <emmanuel.marfo at postgrad.otago.ac.nz>
Cc: gate-users <gate-users at lists.opengatecollaboration.org>
Subject: Re: [Gate-users] Dose actor shows zero valuesand STL file not
        in the center of defined geometry
Message-ID:
        <CAAGVOV=m8qqOQnHCBFfOjk0VCfwD1XbMrK=H33eNN7bqYShsXw at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hi Emmanuel,

Some possibles solution.

1- I had the same problem a couple of times, I use Freecad to change the
position of the STL structure. STL are tricky because they keep the space
localization. What I do, normally is:
A- I use Freecad, I open a new file.
B- Import STL file.
C- Measure the SLT size (https://www.freecadweb.org/wiki/Mesh_BoundingBox)
D- Translate the MESH using the first set of coordinates (but using
negative values). This procedure moves your STL to a (0,0,0) position. (see
attached image)
E- Always is useful (at lest for me) to create a box with the same STL
dimensions if the STL is totally hiddenby the box is because the
translation was fine. (see attached image)
F- Anyway always you have to check visually what is going in the simulation
space. But at least this procedure will improve the localization.
G- EXTRA: If you want, you can apply a angular translation in freecad to
change the orientation of your phantom.

2- I also faced this problem. One option is create a vacuum volume (box)
("miniworld"), then include your source there (daughter of  "miniworld" ),
then your mesh structure (also daughter of "miniworld"). Try this and let
see. If I am not wrong it will resolve the problem.
In general avoid to link the source and the phantom directly to the world
volume, and play with the hierarchy and order.

Best regards
Maikol


El El lun, 2 jul 2018 a las 2:19, Emmanuel Marfo <
emmanuel.marfo at postgrad.otago.ac.nz> escribió:

> Dear Sir/Gate Uers,
>
> Please, I have two main challenges
>
>
>    1. STL file not in the centre of the defined geometry
>    2. Dose actor showing zero value results
>
> I have attached a couple of STL files created with different procedures. I
> believed the attached STL files should work in the GATE simulation for dose
> scoring. However, the imported STL in the simulation is not located in the
> centre. I used placement/translation to get it in the right position for
> the simulation to run. Furthermore, the dose actor shows zeros values.
> Please, I need some help to figure it out where the problem might be,
> possibly from the STL files which I have attached. thanks.
>
>
> Best regards,
>
> Emmanuel Marfo
>
> Student
>
> University of Otago
>
>
>
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