[Gate-users] About the voxelized source

[Simon Stute]

Hi again,

The voxelized source have to be moved half of the total size in each
direction.
So if your voxelized source is for example 300 x 400 x 500 mm, you have to
use:

/gate/source/voxel_brain/setPosition   -150 -200 -250 mm

This problem is caused by G4, it is its natural behaviour, so we did not
change it.

And there is no problem using the same input image as attenuation and
activity maps.
But Gate will not understand by itself that images have to be to coincide
with each other.

Concerning the visualization, I don't know.

Cheers,
Simon

On Mon, Apr 12, 2010 at 7:55 AM, Qiyong Fan <fanqy05 at gmail.com> wrote:

> Dear All,
>
> I imported a voxelized source from an Interfile Image and convert the image
> values into activities. I am not sure how GATE define the position of a
> voxelized source. So I use the following command, which is used by the
> example code, to change the position of the source
>
> /gate/source/voxel_brain/setPosition   0 -400 -400 mm
>
> However, when I use the visualize command shown below, the source seems
> always like a point source in the centre of World.
>
> /gate/source/voxel_brain/visualize 5000 white 20
>
> Dose anybody know how to visualize a voxelized source? Also, when the
> voxelized source imported, what is default position of it?
>
> Say I import the voxelized phantom and source from the same Interfile
> Image,
> does it mean that the phantom and source coincide with each other voxel by
> voxel?
>
> Thanks for your reading,
>
> Qiyong Fan
> Phd Student, Georgia Tech
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