[Gate-users] missing event IDs in hits file

Rajaram, Ramya (H USA) ramya.rajaram at siemens.com
Thu Jan 27 22:56:18 CET 2011

Hi Piotr,

I have tried to put the point source at various locations in front of the detector but the problem of missing eventIDs in the hits file still exists. Also, with the visualization commands enabled, it appears that the particles are hitting the detector. So I don't know what is wrong. Could it be somehow related to using pixelated detectors? With a continuous crystal like NaI, I noticed that the eventIDs are much more (yet not completely) continuous.

Thank you very much for offering to investigate the issue. Please let me know if you get a chance to resolve it.


-----Original Message-----
From: Piotr Mazur [mailto:pietrmazur at gmail.com] 
Sent: Thursday, January 27, 2011 3:17 PM
To: Rajaram, Ramya (H USA)
Subject: Re: [Gate-users] missing event IDs in hits file


You are right!! It's not working. I will take a look at this but I
suppose just as Marlen - all events miss the detector. I will give a
try to run it, at the same time my hint is to put more attention to
check whether point source doesn't hit the detector. Other problem is,
which is also very interesting for me -> isn't it the problem when the
source is IN the SPECThead?

I will investigate it further


On Thu, Jan 27, 2011 at 9:13 PM, Rajaram, Ramya (H USA)
<ramya.rajaram at siemens.com> wrote:
> Hi all,
> Here's the macro that I am running.
> Thanks,
> Ramya
> -----Original Message-----
> From: Marlen Priegnitz [mailto:m.priegnitz at hzdr.de]
> Sent: Thursday, January 27, 2011 2:53 AM
> To: Rajaram, Ramya (H USA)
> Cc: gate-users at lists.opengatecollaboration.org
> Subject: Re: [Gate-users] missing event IDs in hits file
> Hi,
> Maybe this is, because some events don't hit the detector but leave the
> "World" without any interaction in sensitive detectors?
> Kind regards,
> Marlen
> Rajaram, Ramya (H USA) wrote:
>> Dear Gaters,
>> I am currently trying to simulate a very simple set-up: a point source
>> at a certain distance from a detector inside a SPECThead. All the
>> volumes are attached to either phantomSD or crystalSD. ASCII output is
>> enabled and in the Hits.dat file that is generated after the simulation,
>> some eventIDs are missing. Why would that be? I thought eventID is the
>> one unique and continuous column that helps keep track of all the list
>> mode information across the Hits, Singles, SinglesAdder,
>> SinglesBlurring, etc data files. Is that not right?
>> Any help is greatly appreciated,
>> Thank you,
>> Ramya
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> --
> Marlen Priegnitz             |  Helmholtz-Zentrum Dresden-Rossendorf
> Tel. : 0351/260 3307         |
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> Email: m.priegnitz at hzdr.de   |  D-01314 Dresden
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> officially called Forschungszentrum Dresden-Rossendorf.

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