[Gate-users] Simulation stuck at geometry initialization in Gamma camera simulation

[Khalid Hussain]

Dear Matthew,

Thanks a lot for your reply.

Yes there is 0.02cm layer of air in between each layer.

Maybe my simulation stuck because of these large numbers of repetitions.
Now I used another approach and it's working now.

Thank you for your consideration.



*KHALID HUSSAIN *| *PhD Scholar*
*Universiti Putra Malaysia (UPM), Malaysia*
Email:hussain.khalid at student.upm.edu.my
Cell: *+60-11-6455-2354*


On Tue, Sep 8, 2020 at 6:25 PM Matthew Strugari <matthew.strugari at dal.ca>
wrote:

> Hi Khalid,
>
>
>
> My guess is that your simulation appears to be stuck due to your extreme
> number of repeating elements: 347x261x100. That’s a lot and on top of that,
> the geometry that you’re repeating is comprised of a daughter volume. I
> wonder if there is a more efficient way of defining your collimator. Is
> your intention to have a 0.02 cm layer of air in between each layer of mesh?
>
>
>
> Cheers,
>
> Matthew
>
>
>
> *From: *Gate-users <gate-users-bounces at lists.opengatecollaboration.org>
> on behalf of Khalid Hussain <khalidhussain1134 at gmail.com>
> *Date: *Tuesday, September 8, 2020 at 02:58
> *To: *gate-users <Gate-users at lists.opengatecollaboration.org>
> *Subject: *[Gate-users] Simulation stuck at geometry initialization in
> Gamma camera simulation
>
>
>
> *CAUTION:* The Sender of this email is not from within Dalhousie.
>
> Dear Users,
>
> I am simulating wire mesh collimator gamma camera, carefully designed all
> geometry with no error but the simulation stuck at geometry
> initialization step, I wonder what the problem will be, your opinions can
> help me
>
>
>
> if we use values for xy or yz or any 2d combination and set 1 for third
> dimention in the repeat cubic array then it works fine but stuck when using
> values for x,y and z directions for the repeat cubic array.
>
>
>
> e.g
>
>
>
>
>
> Thank you for your time and help.
>
>
>
>
>
> Regards
>
> Khalid Hussain
>
> PhD Student, UPM
>
>
>
>
>
> On Sun, Sep 6, 2020 at 2:48 PM Khalid Hussain <khalidhussain1134 at gmail.com>
> wrote:
>
> Dear gate users,
>
>
>
> I humbly request and need your favor, *my gamma camera simulation stuck
> at Initialization of geometry without any error or even warning.*
>
> The problem is in repeat cubic array, if I use partial value of this
> repeat cubic array then it works fine but stuck for the required value that
> cover the whole collimator.
>
>
>
> I attached whole detail and macro files in this thread.
>
>
>
> Your cooperation is highly appreciated.
>
>
>
> Thanking you.
>
>
>
> On Sat, Sep 5, 2020, 7:44 AM Khalid Hussain <khalidhussain1134 at gmail.com>
> wrote:
>
>
>
> Dear Gate users,
>
>
>
> I checked geometry from each x,y and z directions and it seems to be fine
> but still simulation stuck without any error at *Initialization of
> geometry *
>
>
>
> The macro files are also attached
>
> Your kind cooperation is highly appreciated
>
>
>
> Regards
>
> Khalid Hussain
>
> PhD Student, UPM
>
>
>
>
>
> On Wed, Sep 2, 2020 at 10:24 PM Khalid Hussain <
> khalidhussain1134 at gmail.com> wrote:
>
> Dear Gate users,
>
>
>
> My simulation stuck at geometry initialization in vGate 8.2, I have tested
> the geometry by expanding in two dimensions and it seems okay for all
> combinations but stuck when using full geometry in 3D.
>
>
>
> Please see below script of suspected part of geometry.
>
>
>
>
> ############################
> # LOW ENERGY HIGH RESOLUTION COLLIMATOR #
> ############################
>
> # C O L L I M A T O R
>
> /gate/SPECThead/daughters/name collimator
> /gate/SPECThead/daughters/insert box
> /gate/collimator/geometry/setXLength 59.1 cm
> /gate/collimator/geometry/setYLength 44.5 cm
> /gate/collimator/geometry/setZLength 4.0 cm
> /gate/collimator/placement/setTranslation 0. 0. -3.8 cm
> /gate/collimator/setMaterial Air
> /gate/collimator/attachPhantomSD
> /gate/collimator/vis/forceWireframe
> /gate/collimator/vis/setColor white
>
>
> ## Insert upper boundary of hole
>
> /gate/collimator/daughters/name hole
> /gate/collimator/daughters/insert box
> /gate/hole/geometry/setXLength 0.17 cm
> /gate/hole/geometry/setYLength 0.17 cm
> /gate/hole/geometry/setZLength 0.02 cm
> /gate/hole/placement/setTranslation 0. 0. 0. cm
> /gate/hole/setMaterial Lead
> /gate/hole/vis/forceWireframe
> /gate/hole/vis/setColor blue
> ## Insert lower boundary of hole
>
> /gate/hole/daughters/name lowerB
> /gate/hole/daughters/insert box
> /gate/lowerB/geometry/setXLength 0.15 cm
> /gate/lowerB/geometry/setYLength 0.15 cm
> /gate/lowerB/geometry/setZLength 0.02 cm
> /gate/lowerB/placement/setTranslation 0. 0. 0. cm
> /gate/lowerB/setMaterial Air
> /gate/lowerB/vis/forceWireframe
> /gate/lowerB/vis/setColor green
>
> # FILL THE WHOLE COLLIMATOR WITH SEPTA-HOLE
> /gate/hole/repeaters/insert cubicArray
> /gate/hole/cubicArray/setRepeatNumberX 347
> /gate/hole/cubicArray/setRepeatNumberY 261
> /gate/hole/cubicArray/setRepeatNumberZ 100
> /gate/hole/cubicArray/setRepeatVector 0.17 0.17 0.04 cm
>
>
>
> Any help is highly appreciated.
>
>
>
> Thanks and regards
>
> Khalid
>
>
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