[Gate-users] GateDoseSpectrumActor
Andreas Resch
andreas.resch at meduniwien.ac.at
Wed Feb 2 09:59:08 CET 2022
Hi Maikol,
I just see, that the wiki for the EnergySpectrActor is not up to date
(will be by next week).
Have you tried to use the command:
enableEdepHisto true
this gives you the edep per history. It should be the same as in the
DoseSpectrumActor with the difference that the latter is using
BeginOfEventAction to score and EdepActor uses EndofEvent. Would be
interesting to check what happens if you have a single event only. I
would expect that DoseSpectrumActor returns no entry, but EdepActor
does. Could you check that?
best,
Andreas
Am 2022-02-02 08:52, schrieb Maikol Salas Ramirez:
> Hi Andreas,
>
> I see the practicality in the GateDoseSpectrumActor. As far as I know,
> no other actor calculates the energy and its uncertainty so quickly (at
> least for a logical volume). The ESpectrActor always requires some
> post-processing, normally it is no big deal, but it is nice to have the
> result without intermediate steps.
>
> On the other hand, your approach "square of the bin vector in a post
> processing step" will not lead to the same result. The uncertainty
> calculation in one single simulation is a history-by-history method
> (error = sqrt( (1.0 / ( numPart - 1)) * ( avgEnergySq - pow(
> avgEnergyOut, 2)))), it means the energy contribution (square) is
> scored per history. The ESpectrActor does not make this distinction. It
> mixes all the contributions.
>
> From my point of view, the GateDoseSpectrumActor does not cause any
> damage. It can continue inside of GATE, but if there is a change to
> update it or translate its features to the ESpectrActor it would be
> nice.
>
> Best,
> Maikol
>
> El mar, 1 feb 2022 a las 15:10, Andreas Resch
> (<andreas.resch at meduniwien.ac.at>) escribió:
>
> Hi David, Maikol,
>
> just had a brief look into the source code of DoseSpectrumActor. Looks
> fine at the first glance, but is obsolete as 1 of the two scoring
> results is also part of ESpectrActor. Would be only few lines of extra
> code to add the second option (square of energy deposit) to
> ESpectrActor. Although I wonder if it is really necessary. Shouldn't it
> be enough to do the square of the bin vector in a post processing step?
> (using a high resolution binning of course)
>
> best,
>
> Andreas
>
> Am 2022-02-01 10:17, schrieb Maikol Salas Ramirez:
>
> Hello David,
>
> Thank you for the answer. I re-check my calculation, and I found out
> that the units are well (I mean the EnergySpectrumActor and
> GateDoseSpectrumActor agree in the deposited energy calculations).
>
> To check it, I attached both actors to the same logical volume and
> calculated the deposited energy for comparison. In the case of
> EnergySpectrumActor, I summed the energy spectrum, and for
> GateDoseSpectrumActor, it provides the total energy (sum) plus the
> uncertainty directly.
>
> The GateDoseSpectrumActor has the advantage that it provides the total
> deposited energy with its uncertainty. This information is impossible
> to obtain with the EnergySpectrumActor, because it does not give the
> square of the sum of the energies.
>
> I think the GateDoseSpectrumActor could be useful for the community.
> But, it is not documented in the opengate.readthedocs.io [1], and the
> C++ classes are probably incomplete (probably the goal was the absorbed
> dose calculation, but its development stops with the energy
> calculation). At this moment, the GateDoseSpectrumActor help me resolve
> my task straightforwardly. I think it is better to keep it. Hopefully,
> it will be a chance to improve it in the future.
>
> I am finalizing some details of the simulation (blood irradiation with
> radionuclides); if it would interest you, I can share it for the GATE
> examples with some documentation.
>
> Best regards,
> Maikol
>
> El mar, 1 feb 2022 a las 8:05, David Sarrut
> (<david.sarrut at creatis.insa-lyon.fr>) escribió:
> Hello Maikol,
>
> I don't know this actor and, looking at the history, it was started
> before we started the git version (2015), so the original author is
> lost.
> As there is no doc and I don't really get what it means compared to the
> EnergySpectrumActor, I would suggest to remove it.
>
> However, if you think it could be useful for you, please let us know.
> The idea would be to propose some docs and use case.
>
> thanks,
> David
>
> On Mon, Jan 31, 2022 at 5:50 PM Maikol Salas Ramirez
> <mmsalas at gmail.com> wrote:
>
> Dear Gate users,
>
> Recently I found the .cc and .hh files of a GateDoseSpectrumActor. This
> actor is not mentioned in opengate.readthedocs.io [2] or any webpage.
> I would like to ask if someone is working on it. Is it a prototype?
>
> I tested the energy calculation using the EnergySpectrumActor and the
> energy units differ:
>
> I simulated a Ac-225 source using the Ion source definition. I scored
> the deposited energy with both actors (EnergySpectrumActor and
> GateDoseSpectrumActor). The deposited energy differs by a factor of
> 1000. The only justification that I can find is that, in the
> GateDoseSpectrumActor, the deposited energy is expressed in keV/(1000
> events) OR (eV/event) and there is a typo in the code (the units shoud
> be eV instead of keV):
> #-------------------------------------------
> /// Save data
> void GateDoseSpectrumActor::SaveData()
> {
> GateVActor::SaveData();
> std::ofstream DoseResponseFile;
> OpenFileOutput(mSaveFilename, DoseResponseFile);
> DoseResponseFile << "Incoming energy (keV)" << " "
> << "Average energy deposit (keV)" << " "
> << "Energy uncertainty (keV)" << Gateendl;
> std::map< G4double, G4double>::iterator itermEnergy;
> for( itermEnergy = mEnergy.begin(); itermEnergy != mEnergy.end();
> itermEnergy++)
> {
> G4double energyIn = itermEnergy->first;
> G4double totEnergyOut = mEnergy[energyIn];
> G4double numPart = mNumParticPerEnergy[energyIn];
> G4double avgEnergyOut = totEnergyOut / numPart;
> G4double avgEnergySq = mEnergySquare[energyIn] / numPart;
> G4double error = sqrt( (1.0 / ( numPart - 1)) * ( avgEnergySq - pow(
> avgEnergyOut, 2)));
> DoseResponseFile << energyIn/keV << " "
> << avgEnergyOut/keV << " "
> << error/keV << Gateendl;
> }
> #-------------------------------------------
>
> Is anyone working on this?
>
> Best regards
> Maikol
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> --
>
> David Sarrut, Phd
> Directeur de recherche CNRS
> CREATIS, UMR CNRS 5220, Inserm U1294
> Centre de lutte contre le cancer Léon Bérard
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> _________________________________
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