[Gate-users] Track stuck or not moving

[Howard]

Hi Sveta,

I am using an STL file as a beam modifier for X-ray imaging, not as a
radioactive source, though.

Howard

On Mon, Sep 23, 2019 at 3:26 AM Sveta <sveta at txcorp.com> wrote:

> Hi Howard,
> Did you use an STL file with assigned activity?  We have not found the
> setup with an STL as a source and ended up with a voxelized phantom
> instead.  How did you do this?
> Thanks,
>
> iSveta
>
> On Sep 23, 2019, at 3:26 AM, Howard <lomahu at gmail.com> wrote:
>
> Hi Catherine,
>
> I am not using a voxelized phantom, but instead using a "tessellated"
> volume in the STL form. That might be the problem. But why did this not
> happen when I ran less events (2x10^7 events)? I am also wondering if the
> extra long simulation time (~6000 mins for a very simple CT imaging setup)
> is due to this? Thanks a lot for your help!
>
> Howard
>
> On Sun, Sep 22, 2019 at 10:07 PM Catherine Costa Oliveira da Silva <
> catherinecos at gmail.com> wrote:
>
>> Hi Howard,
>>
>> I had the same problem as you.
>> If you are using a voxelized phantom with the setting
>> "ImageRegularParametrisedVolume", try to change for
>> "ImageNestedParametrisedVolume".
>>
>> Best Regards,
>> *Catherine *
>>
>> Em dom, 22 de set de 2019 às 22:48, Howard <lomahu at gmail.com> escreveu:
>>
>>> Hi Matthew and Svetlana,
>>>
>>> Thank you for your replies. Can you a bit more specific about the
>>> production cuts? In the warning it says:
>>>
>>> ......
>>> Trying pushing it of 1e-07 mm ...Potential overlap in geometry!
>>>
>>> But I do not know what to change in my scripts though. I do not believe
>>> I have overlapping geometry since the same geometry was working totally
>>> fine when I tried to generate 2x10^7 events. Still confused.
>>>
>>> Howard
>>>
>>> On Sun, Sep 22, 2019 at 2:39 PM Matthew Strugari <
>>> matthew.strugari at dal.ca> wrote:
>>>
>>>> Have you verified that your geometry is not overlapping?
>>>>
>>>> Matthew
>>>>
>>>> On Sep 22, 2019, at 2:14 PM, Svetlana Shasharina <sveta at txcorp.com>
>>>> wrote:
>>>>
>>>> Hi,
>>>>
>>>> You would try to change production cuts to be a little bit bigger.
>>>>
>>>> Best,
>>>>
>>>> Svetlana
>>>> On 9/22/19 10:52 AM, Howard wrote:
>>>>
>>>> Hi,
>>>>
>>>> I was simulating a X-ray imaging process with 2 x 10^9 events. It has
>>>> been running over 5200 minutes and still ongoing. From the output I saw the
>>>> following warning message about "Track stuck or not moving" as attached
>>>> below (multiple times). However, when I ran 2 x 10^7 events I did not have
>>>> the same warming issue and the simulation was completed < 20 hours
>>>> successfully. Should I worry about this warning or just ignore it and
>>>> continue to wait? Thanks a lot!
>>>>
>>>> Howard
>>>>
>>>> -------- WWWW ------- G4Exception-START -------- WWWW -------
>>>> *** G4Exception : GeomNav1002
>>>>       issued by : G4Navigator::ComputeStep()
>>>> Track stuck or not moving.
>>>>           Track stuck, not moving for 10 steps
>>>>           in volume -world_phys- at point
>>>> (-5.649999594721559,4.81816525126774,-38.09301491743752) (local point
>>>> (-5.649999594721559,4.81816525126774,-38.09301491743752))
>>>>           direction:
>>>> (0.6222482514791153,-0.3555437239478714,0.6974208011612956) (local
>>>> direction: (0.6222482514791153,-0.3555437239478714,0.6974208011612956)).
>>>>           Potential geometry or navigation problem !
>>>>           Trying pushing it of 1e-07 mm ...Potential overlap in
>>>> geometry!
>>>>
>>>> *** This is just a warning message. ***
>>>> -------- WWWW -------- G4Exception-END --------- WWWW -------
>>>>
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