[Gate-users] Simple Particle Counting Actor

[Robert Wilson]

Dear Akiv,

I know exactly what you're going through, and I'm glad to know that I'm
actually able to help someone else on here. So the simplest solution that
you're looking for is the Kill Track actor. It's the actor described in the
manual just before the Dose actor. It does exactly what you're wanting. The
output is a .txt file that just spits out the number of particles that were
stopped by the volume that the actor is attached to.
It should be noted that this actor is not energy or particle dependent, so
if you have a lot of different particles flying around your simulation,
you're going to want to add a particle filter to the actor.
I'm currently not at my work computer that has GATE and all of my code, but
if you like I can send you a few lines as an example for how I'm doing the
exact same thing when I do get to it. I hope this helps, and if you need
any other help, please don't hesitate to ask.

Best regards,

*R. Kevin Wilson*

San Diego State University | *2017*
Department of Physics | *M.S Medical Physics*
Radiation Detection Measuring & Modeling Laboratory
*PET/SPECT Modeling - Gate & GEANT4*



Clemson University | *2015*
College of Engineering & Science
Department of Physics & Astronomy | *B.S. Applied Physics*
CU EBIT & Atomic Physics Laboratory *|* *Intern Recipient and Student
Researcher*


rkwilson at mail.sdsu.edu
rkwilso at g.clemson.edu
(828) 216-5310

On Thu, Jun 8, 2017 at 1:33 AM, Andreas Resch <
andreas.resch at meduniwien.ac.at> wrote:

> Am 2017-06-07 18:46, schrieb Akiv Jhirad:
>
>> Hello,
>>
>> I have currently been using the DoseActor attached to a small geometry
>> (representing my detector) with a resolution of 1x1x1 along with the
>> NumberOfHits parameter, to find the total number of particles
>> interacting with my detector. Is there a better alternative to achieve
>> the same task?
>>
>> I wanted to try the FluenceActor but don't want my output being of
>> .mhd format. Will I simply get the number of particles detected in my
>> detector if I just change the output format to .txt instead of .mhd?
>>
>> --
>> Best Regards,
>> Akiv Jhirad
>> _______________________________________________
>> Gate-users mailing list
>> Gate-users at lists.opengatecollaboration.org
>> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>>
>
> Hi,
>
> I didn't know that there is the number of Hits option in the dose actor.
> However, I checked in the source code and this is the line of interest
> (version 7.2):
> if (mIsNumberOfHitsImageEnabled) mNumberOfHitsImage.AddValue(index,
> weight);
>
> so, this is definitely not the fluence, but rather gives you the number of
> energy depositions in a voxel. You could try to half or double your step
> limiter, then you should see an increase or decrease of number of hits.
>
> The second option, the fluence actor implementation is more complex. It
> seems, that number of particles is scored if a geometry boundary is
> crossed. So, this actor using the option "/enableNumberOfHits true" would
> probably give you the total number of particles entering your detector.
>
> Note that this number of hits is not the fluence, as fluence is according
> to ICRU report 85 defined as:
> "The fluence, Phi, is the quotient of dN by da, where dN is the number of
> particles incident on a sphere of cross-sectional area da"
>
> Yes, if you want txt output instead of mhd, just change the extension in
> the actor.
>
>
> Cheers,
> Andreas
>
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>
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