[Gate-users] misalignment between a phantom and source

[kangh at mskcc.org]

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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