[Gate-users] Dose Value in mGy

[Andreas Resch]

Hi Emmanuel,

I just made some tests with the DoseActor, the units of:
energy deposition image is: MeV
dose image: Gray = J/kg = eV*q/kg

so if you simulate 1 particle you get the energy (or dose depending on 
what you select) deposition map of 1 particle. If you simulate 10^3 
particles, you get the sum of energy depositions of all these 10^3 
particles. This is important if you simulate a lower (or higher) number 
of particles than "reality". You have to scale accordingly.

If you want the total energy deposition in your phantom, you can sum up 
all voxels' values. If you want the total dose deposition it is (total 
edep)/(total volume). If you only have dose image enabled, you can sum 
the doses over all voxels and divide by the number of voxels to account 
for the increased volume (total Volume = Number of voxels * voxel 
volume). But only if your phantom is homogeneous.

So as Alessio mentioned, it is easier to work with the energy deposition 
rather than dose. I hope this helps and please correct me if I am wrong.

Cheers,
Andreas

I hope this helps. Correct me if I am wrong.


Am 2017-06-28 13:35, schrieb Elia Alessio:
> Dear Emmanuel,
> 
> it depends on what you need to do. For example, if we consider a water
> box and you want an average dose released to the whole box, the sum-up
> approach is in principle ok. The easiest way would be to think in
> terms of energy deposited instead of dose: you can sum up all the
> contributions for every single voxel and divide for the total mass of
> your water box.
> 
> Maybe you were referring to a more specific problem and I
> misunderstood your question?
> 
> Cheers,
> 
> Alessio
> 
> FROM: Gate-users
> [mailto:gate-users-bounces at lists.opengatecollaboration.org] ON BEHALF
> OF Emmanuel Marfo
> SENT: Mittwoch, 28. Juni 2017 11:59
> TO: gate-users at lists.opengatecollaboration.org
> SUBJECT: [Gate-users] Dose Value in mGy
> 
> Dear Gate-Users,
> 
> Please, just a quick question about dose in mGy. Earlier on in a mail
> in the Gate-User mailing list. I ask about how one could get the dose
> voxels as one value and I had a reply that I should sum all the dose
> voxels matrices and multiply by 1000 to get in mGy. My supervisor did
> not agree with me on that. Please, is there a publication I could
> refer to.
> 
> Thanks.
> 
> Best regards,
> 
> Emmanuel
> 
> DISCLAIMER:
> Please notice our E-Mail Disclaimer
> http://www.medaustron.at/email-disclaimer/ [1]
> 
> 
> Links:
> ------
> [1] http://www.medaustron.at/email-disclaimer/
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users