[Gate-users] NEMA phantom activity specification

Simon Stute gate.stute at gmail.com
Tue Jun 1 12:30:00 CEST 2010

Hi Naser,

Defining an amount of activity is for a whole volume.
So your first way to specify your activity is correct.
Except that when you define an activity volume inside another one (for your
spheres), the activity of the background is still there (in your spheres).
So you have to multiply by 7 to get a contrast of 8:1.

And I think source visualization is not possible in gate_v4.


On Mon, May 31, 2010 at 8:01 PM, Naser Darwish <naser.darwish at gmail.com>wrote:

> Dear Gate users,
> I am trying to specify activity in the NEMA_IQ 2001 phantom in GATE.
> What I used is the standard 15mCi/70kg body, which amounts to 7928 Bq/ml (
> 555000000Bq/70kg)x(1kg/1000ml=7928Bq/ml)
> The volume of the background is 3.14x14^2x21.35=13146 and therefore the
> activity to the background is 13146x7928=104221488 Bq. For the other hot
> spheres, I muliptly the volume of the sphere by 7928 Bq/ml times 8 for
> contrast of 8 to 1 ratio. Is this the right way to specify activity or do I
> need to specify total activity 15mCi to the background and 15mCi x 8 for
> the
> hot spheres?
> Is there a way to visualize the sources with GATE 4.0 ?
> Your help is greatly appreciated.
> Best regards,
> Naser
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