[Gate-users] Interfilereader for voxelized phantom or source

[Niklas Rehfeld]

Dear Hyejoo,

> I found that in "GateGeometryVoxelIntefileReader.cc" that "slice
> thickness (pixels)" in intefiles read as mm. I compared an interfile
> header and dicom header of the same image and found that "slice
> thickness (pixels)" in the interfile header is actually thickness in the
> size of the pixels instead of mm.  Could you clarify this?

Yes, I noticed this problem, too.

>
> Also, I am wondering whether GATE should use "slice thickness (pixels)"
> or "center-center slice separation (pixels)" to calculation the
> dimension in axial-direction.  What I heard is to use "center-center
> slice separation".

I did not read the interfile standard, but I guess that the two  
variables are there to allow for an area between the slices that is  
not imaged.

This should be the case if

slice thickness(mm)<center-center slice separation

In my opinion Gate should check if the abovementioned inegality is  
true and  give a warning if so, and then proceed with the  
"center-center slice separation" value.

Niklas