[Gate-users] RE : Dose actor and uncertainties

[REUZE SYLVAIN]

Thanks Nicolas and Simon for your help. I finally solved my problem alone, it was due to a basic error in my analysis program. Sorry !
Best regards,
Sylvain


________________________________
De : narbor [nicolas.arbor at iphc.cnrs.fr]
Date d'envoi : mercredi 5 août 2015 21:56
À : gate-users at lists.opengatecollaboration.org; REUZE SYLVAIN
Objet : Re: [Gate-users] Dose actor and uncertainties

Hi Sylvain,
Here is a short summary (in french) about dose uncertainty in GATE that I've wrote some times ago (it's a personnal note...so quite basic and not very well written).
Hope it helps to answer your questions.
If something is not clear, don't hesitate to send me a mail.
Best regards,
Nicolas Arbor

***********************************************************************
Nicolas ARBOR
Maître de Conférences
Université de Strasbourg - UFR Physique et Ingénierie
Groupe de recherche RaMsEs - Institut Pluridisciplinaire Hubert Curien
23, rue du Loess BP28 67037 Strasbourg Cedex 2
mail : nicolas.arbor at iphc.cnrs.fr<mailto:nicolas.arbor at iphc.cnrs.fr> / tel : 03.88.10.64.27
***********************************************************************

Le 05/08/2015 13:38, REUZE SYLVAIN a écrit :
Dear Gate users,

I have an issue with dose actor uncertainties. I’ve read several threads on the mailing list about uncertainty calculation, but I don’t understand the output of the dose-uncertainty file.
In my simulation, I have a linac model with an input phase space at the end of the patient-independent part, and I would like to know uncertainty in a region of interest of my dose chart, recorded in a water phantom.

Values of the dose chart very low (~ 10^-8), and values of the uncertainty chart are between 6 and 10. Are these values relative (in %) or absolute ?

And when I try to use dose squared and dose with a formula (Visvikis et al.: https://hal.archives-ouvertes.fr/in2p3-00025095/document), I have negative values under the square root.

Could you help me ?

Best regards,

Sylvain Reuzé
Intern in medical physics
GUSTAVE ROUSSY
Radiotherapy - Medical Physics Department
Tél. : (+0033) 1 42 11 54 06
www.gustaveroussy.fr<http://www.gustaveroussy.fr/>
[cid:part3.02000204.08040101 at iphc.cnrs.fr]





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