[Gate-users] Dose Uncertainty

[Josh Knowland]

David, thank you for the detailed answer! Very helpful.


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________________________________
From: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> on behalf of David Boersma <david.boersma at acmit.at>
Sent: Thursday, August 1, 2019 5:09:28 AM
To: gate-users at lists.opengatecollaboration.org <gate-users at lists.opengatecollaboration.org>
Subject: Re: [Gate-users] Dose Uncertainty


Hello Josh,


Ideally you would find answers to such questions in our documentation. In our old docs ...:

http://wiki.opengatecollaboration.org/index.php/Users_Guide:Tools_to_Interact_with_the_Simulation_:_Actors#Dose_measurement_.28DoseActor.29


... and in the new (same text, different format) docs ...:

https://opengate.readthedocs.io/en/latest/tools_to_interact_with_the_simulation_actors.html#dose-measurement-doseactor


... it just says "The uncertainty is the relative statistical uncertainty." In other words, the error is unit-less, the value 0.001135445931 in your example means that the relative uncertainty (standard deviation divided by the value) is 0.11%.


For calculating this relative uncertainty, the "DoseActor" code actually computes the ratio of the "standard deviation of the dose per primary" and the "dose per primary". So in addition to the "dose" (sums of doses due to each successive primary) and "dosesquare" (sum of squares of doses due to each successive primary), the number of primaries is a necessary ingredient of the calculation. Especially if you want to compute the combined uncertainty of several simulations. For the full monty read Chetty 2006, DOI: 10.1016/j.ijrobp.2006.03.039. 😊


Hope that helps,

David



________________________________
Von: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> im Auftrag von Josh Knowland <jknowland at lucernodynamics.com>
Gesendet: Mittwoch, 31. Juli 2019 16:26:38
An: gate-users at lists.opengatecollaboration.org
Betreff: [Gate-users] Dose Uncertainty


All – good morning,

How can I interpret the dose-uncertainty output from Gate? I have Dose, Dose-Squared, and Dose-Uncertainty text files, but what units are the uncertainty number?







Dose

####################################

# Matrix Size= (10,10,10)

# Resol      = (1,1,1)

# VoxelSize  = (10,10,10)

# nbVal      = 1

####################################

2.879146507e-05





Dose-Squared

####################################

# Matrix Size= (10,10,10)

# Resol      = (1,1,1)

# VoxelSize  = (10,10,10)

# nbVal      = 1

####################################

3.463765531e-15





Dose-Uncertainty

####################################

# Matrix Size= (10,10,10)

# Resol      = (1,1,1)

# VoxelSize  = (10,10,10)

# nbVal      = 1

####################################

0.001135445931










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