[Gate-users] Further documentation of output images created by the FixedForcedDetection Actor

[Simon Rit]

Hi,

I assume you've read

http://wiki.opengatecollaboration.org/index.php/Users_Guide_V7.2:Readout_parameters_for_Radiotherapy_applications:_Actors#Fixed_Forced_Detection_CT?

It's scarce but there are a bunch of references we suggest to understand 
the technique. The numbers are the expected signal in the image. All 
contributions are summed in total which can be decomposed in 
primary+secondary. Secondary (same as scatter) can itself be decomposed 
in compton+rayleigh+fluorescence. flatfield is available to compute the 
measured primary signal if there is no object, this is useful for CT to 
apply the beer Lambert law. attenuation is ln(flatfield/primary) to get 
the line integral, i.e., the input of most CT reconstruction algorithms.

An alternative is to do pure monte carlo, see monteCarloCT.mac in the 
same folder. I guess there are other options in Gate but I don't know 
all the CT options in Gate. Please let me know if you find some!

Hope this helps and let us know if/how we should complete the "doc",

Simon


On 02/09/2016 09:49, Lukas Gromann wrote:
> Dear all,
>
> I am currently learning how to use Gate for my PHD project in medical 
> x-rax imaging.
>
> I would like to simulate the Compton scatter fraction in a simple 
> Thorax x-ray. I started by using the 
> example_CT/fixedForcedDetectionCT, which looks like the thing I am 
> looking for. Unfortunately I cannot find any documentation, what is 
> actually the content of the outputfiles created by the 
> FixedForcedDetection actor. What does the numbers in the various 
> images represent? What is the purpose of the flatfield file?
> Any kind of additional documentation/information would be very welcome!
>
> On the other hand, is there maybe a much better approach to determine 
> Compton scatter fractions in my images than using the FFD actor?
>
> Thanks for your help,
>
> Lukas
>
> ----------------------------------------------------
> Lukas Gromann
>
> Lehrstuhl für Biomedizinische Physik (E17)
> Technische Universität München
> Boltzmannstrasse 11
> 85748 Garching
>
> Lukas.Gromann at TUM.de <mailto:Lukas.Gromann at TUM.de>
>
> Tel.: 089-289/10905
> Mobil: 017629718306
>
>
>
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users

On 02/09/2016 09:49, Lukas Gromann wrote:
> Dear all,
>
> I am currently learning how to use Gate for my PHD project in medical 
> x-rax imaging.
>
> I would like to simulate the Compton scatter fraction in a simple 
> Thorax x-ray. I started by using the 
> example_CT/fixedForcedDetectionCT, which looks like the thing I am 
> looking for. Unfortunately I cannot find any documentation, what is 
> actually the content of the outputfiles created by the 
> FixedForcedDetection actor. What does the numbers in the various 
> images represent? What is the purpose of the flatfield file?
> Any kind of additional documentation/information would be very welcome!
>
> On the other hand, is there maybe a much better approach to determine 
> Compton scatter fractions in my images than using the FFD actor?
>
> Thanks for your help,
>
> Lukas
>
> ----------------------------------------------------
> Lukas Gromann
>
> Lehrstuhl für Biomedizinische Physik (E17)
> Technische Universität München
> Boltzmannstrasse 11
> 85748 Garching
>
> Lukas.Gromann at TUM.de <mailto:Lukas.Gromann at TUM.de>
>
> Tel.: 089-289/10905
> Mobil: 017629718306
>
>
>
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users

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