[Gate-users] What happens when two sources are in superposition

Maxime Toussaint maxime.toussaint at usherbrooke.ca
Mon Mar 19 20:17:48 CET 2018


I was looking at the Gate documentation to reproduce a derenzo-like 
phantom and when it came to define the sources activity, I was unsure 
how to proceed to have a constant ratio between hot spots of different 
size vs the background. What happens when two sources volume are in 
superposition? Does their activity "add up" in the intersected volume?

 From my understanding of the Gate users guide, it would make sense that 
they add up. There does not seems to have a mother/daughter approach to 
the source creation, which would be needed, I think, to define the 
intersection volume. Thus, to obtained a fixed ratio between any hot 
spot vs background, I need to estimate the activity that is expected to 
come from a given hot spot and adjust its activity in consequence.

While I am there, I have another question. Is their a way to search in 
the mailing list archive without checking every month subjects list 

Have a nice day,
Maxime Toussaint

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