[gate-users] superimposed sources

Mutanga Theodore muathe02 at student.umu.se
Wed Oct 6 16:31:32 CEST 2004

Hi Corinne,
I am not answering your question but asking for some help with other GATE
tutorials, I would be grateful if you can give me as much examples to play
around with. I am to develop a tool to simulate PET images using Monte
Carlo, so I need alot of help with that from you guys who have already
been using GATE. Can someone help me with any information on that ?
Also how can I check the integrity of my GATE installation, to make sure
the date and stuff are correct ?


Mutanga Theodore.

> Hi all,
> I know the question has already been asked but I can't find the answer
> in GATE-Talk, so I ask it again... O:-)
> I simulated 6 hot spheres (R=1cm) in a warm cylinder (D=20cm, H=70cm). I
> want a contrast of 5:1. So I did the following to define the activity I
> wanted in each of the volumes:
> for the cylinder: 214.6MBq
> for each sphere: (5-1)x(214.6MBq/(pix10x10x70))x(4xpix1x1x1/3), eg.
> (5-1)x(Cylinder Activity / Cylinder Volume) x (Sphere Volume)
> I used (5-1) and not 5 assuming there will be the annihilations from the
> cylinder AND from the spheres at the sphere location.
> The problem is that I can't recover that contrast in the reconstructed
> data. Can someone tell me if I did something wrong in the activity
> setting?
> Thanks a lot,
> -- Corinne
> ------------------------------------------------------------------------
> Corinne J. Groiselle, PhD
> Research instructor
> Division of Nuclear Medicine / Department of Radiology
> University of Massachusetts Medical School
> 55 Lake Avenue North
> Worcester, MA 01655
> _phone_: (508)-856-6123 - fax: (508)-856-4572
> _e-mail_: Corinne.Groiselle at umassmed.edu
> _professional homepage_: http://users.umassmed.edu/corinne.groiselle
> _personal homepage_: http://corinne.groiselle.free.fr
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