[Gate-users] FW: Gate Error: neutron tracking cuts - std::length_error

[BAKER, Mark (THE CLATTERBRIDGE CANCER CENTRE NHS FOUNDATION TRUST)]

Hi all

Apologies if this double posts. I tried to post it last night but can't see it on the list myself, and then I found it in my Outlook drafts (as well as sent items) when logging in on a different computer. I thought I would post again in case it was a genuine fail the first time.

Hi everyone

I've got some code which seems to run beautifully when playing with Digimouse data. However, I've created a version of the digimouse PT data using 3D slicer where I have used the atlas to segment the heart and masked everything outside this to 0 - my intent is that I've effectively got PT data where every emission occurs from the heart. This data is then saved in the same Analyze (hdr/img) format that the digimouse data originally started life as. Looking at the headers in imageJ, the new masked file does have a few extra fields but everything else matches accordingly.

Unfortunately, when running this simulation, just after building the Reference Physics List QGSP_BERT, it crashes with the following error:

G4VUserPhysicsList::SetDefaultCutValue: negative cut values :-1[mm]
### Adding tracking cuts for neutron TimeCut(ns)= 10000 KinEnergyCut(MeV)= 0
Terminate called after throwing an instance of 'std::length_error'
What(): vector::_M_default_append

This then aborts my bash script which is running the mac. I've searched online and found a post in the archives whereby someone else got a similar std::length_error but that was resolved by removing a space in the file name. I don't have any spaces in my filenames so I'm not sure it is the same cause. I suspect it might be something to do with the Physics.mac but I don't know what. I can run the exact same script and select the original digimouse Analyze data and it seems to be fine. I don't actually care about neutrons in my simulation either.

Any help would be gratefully appreciated!

Thank you

Mark Baker
Principal Clinical Scientist
Imaging Physics (Ionising)
The Clatterbridge Cancer Centre NHS Foundation Trust
(he, him)

CCCW Tel:  0151 556 5030
CCCL Tel: 0151 318 8438
Email: mark.baker23 at nhs.net<mailto:mark.baker23 at nhs.net>
Microsoft Teams (click here)<https://teams.microsoft.com/l/chat/0/0?users=mark.baker23@nhs.net>

Honorary Lecturer, Dept. of Physics
University of Liverpool

[CCC email footer April 2021]




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