[Gate-users] No annihilations in the phantom but just in the source

Park MinJae MJ at JHMI.edu
Wed Jun 30 17:23:53 CEST 2010

Dear Dimitri,

In your first post, you mentioned about 'scattering of positron'.
Moreover, because positron is unstable and easy to be annihilated with
plenty of electron in the world, I wonder about the possibility of
'scattering of positron'.
That's why I was confused. :)

Now, I guess...what you want to do is about positron range.

sourcePos{X,Y,Z} does not mean the annihilation position,
but starting position of positron (e+).

That's why you got the plot.

You can just plot 'positron range'.

Moreover, I strongly suggest you to use ROOT.

Cordially yours,

//  Ph.D. Park MinJae
//  Johns Hopkins University
//  School of Medicine, Dept of Radiology
//  Division of Medical Imaging Physics
//  DialTo:+1-410-955-2684 (Office)
//  MailTo:MJ at ToTi.us, MJ at JHMI.edu
//  Self-discipline to the Right...

On Wed, Jun 30, 2010 at 10:56 AM, Dimitri DWORAK
<dimitridworak at hotmail.com> wrote:
> I have take the position in X and Y  of annihilation in the file Singles.dat (Column 4, 5)
> There aren't any information about scattering in output files but if they have scattering it must have some annihilations out of the source
> and in the phantom but here we see on the graph that they haven't .
> My goal isn't to see scattering but have an ideal of the position of all annihilation in and out of t.he source
> Is it possible that they call annihilation in the wikihelp be the place where the positron is generated and not the position of his annihilation?
> Dimitri
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