[Gate-users] misalignment between a phantom and source

[Simon Stute]

Hi Hyejoo,

It depends on what you want to do but of course it could...
You will have a part of your source out of your phantom so there will be a
lot of non-attenuated photons, that risks to overload your detector if you
have dead-time for example. But again it depends on what you want to do.

Hope you've not lost to much time !
Good luck,
Simon

On Fri, Oct 3, 2008 at 3:45 PM, <kangh at mskcc.org> wrote:

> Hi Sebastien,
>
> Thanks for the reply.  Yes, I shifted the center and I made a mistake
> move to far for a couple of centimeters when I did that.  I wonder
> whether misalignment (~ 2 cm) could cause serious problem.
>
> Thanks again,
>
> Hyejoo
>
> -----Original Message-----
> From: gate-users-bounces at lists.healthgrid.org
> [mailto:gate-users-bounces at lists.healthgrid.org] On Behalf Of Sebastien
> JAN
> Sent: Friday, October 03, 2008 7:57 AM
> To: gate users
> Subject: Re: [Gate-users] misalignment between a phantom and source
>
> Hi,
>
> If I understand correctly your problem, don't forget that the default
> position of the voxelized source is in the 1st quarter of the voxelized
> phantom. This is why you must shift the voxelized source over half its
> dimensions in the negative direction on each axis (as it is note in the
> users guide p. 107 - last version)
>
> Hope this help
> Cheers
> Sebastien
>
> > Hi,
> >
> > I have simulated voxelized phantom/source.  I found that the source
> > and phantom were misaligned about a couple of centimeters in x-y
> > directions. The voxelized source was off from the center about 1.5 cm
> > in each x and y direction.
> >
> > Would it cause any dramatic changes in simulation results?  The
> > dimension in x & y directions is  42 X 30 cm.   I think the phantom
> > and source were properly aligned in z-direction.
> >
> > Thanks,
> >
> > Hyejoo
> >
> >
> >
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