[Gate-users] Problem in modeling a trapezoid

[Ricardo Capote]

Hi Hojjat Mahani,

I also had the same problem. My suggestion is to define very small
dimensions for the volume box:

/gate/world/daughters/name collimator
/gate/world/daughters/insert trpd
/gate/collimator/geometry/setX1Length 10 cm
/gate/collimator/geometry/setY1Length 5 cm
/gate/collimator/geometry/setX2Length 10 cm
/gate/collimator/geometry/setY2Length 1 cm
/gate/collimator/geometry/setZLength ?3.0 ?cm

## These are Gate V.5 commands, I think they are still avaible in V.6
/gate/collimator/geometry/setXBoxLength 0.001 mm
/gate/collimator/geometry/setYBoxLength 0.001 mm
/gate/collimator/geometry/setZBoxLength 0.001 mm

/gate/collimator/setMaterial Lead
/gate/collimator/vis/setColor red
/gate/collimator/vis/forceWireframe

That's a strange solution but I believe it will solve your problem.

Best regards,

-------------------------------------------------------------------
Ricardo Capote

Institute of Biophysics and Biomedical Engineering
Faculty of Science, University of Lisbon
Campo Grande
1749-016 Lisbon

Tel. + 351 21 750 01 77; Fax: + 351 21 750 00 30
Extension: 20510
Email: rmcapote at fc.ul.pt
Website: http://www.ibeb.fc.ul.pt/




2013/11/11 <gate-users-request at lists.opengatecollaboration.org>

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>    1. Problem in modeling a trapezoid (Hojjat Mahani)
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> Message: 1
> Date: Sun, 10 Nov 2013 22:27:21 -0800 (PST)
> From: Hojjat Mahani <hojjat.mahani at yahoo.com>
> To: GATErs <gate-users at lists.opengatecollaboration.org>
> Subject: [Gate-users] Problem in modeling a trapezoid
> Message-ID:
>         <1384151241.75100.YahooMailNeo at web161006.mail.bf1.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear GATE users,
>
> I have modeled a trapezoid as the collimator in my SPECT simulation.?
> Everything seems to be right, but, I have faced an unexpected problem: an
> extra volume exists inside the trapezoid (as shown in attached figure).
>
> Here are the commands used to define aforementioned trapezoid:
>
> # Collimator (Trapezoidal Collimator)
> /gate/world/daughters/name collimator
> /gate/world/daughters/insert trpd
> /gate/collimator/geometry/setX1Length 10 cm
> /gate/collimator/geometry/setY1Length 5 cm
> /gate/collimator/geometry/setX2Length 10 cm
> /gate/collimator/geometry/setY2Length 1 cm
> /gate/collimator/geometry/setZLength ?3.0 ?cm
> /gate/collimator/setMaterial Lead
> /gate/collimator/vis/setColor red
> /gate/collimator/vis/forceWireframe
>
> Any suggestion or idea would be appreciated; thank you in advance.
>
> ?
>
> Hojjat Mahani,
> PhD Candidate of Medical Radiation Engineering.
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