[Gate-users] Voxelized phantom and source voxel number issues

[Emmanuel BRARD]

Dear all, 

 

I am trying to load a voxellized phantom and a voxellized source in a Gate
simulation. The phantom part seems to work properly with the ascii reader
but I have issues with the source. I tried two ways to load it. First with
an ascii file containing the three dimensions on the first line and the
three sizes on the second line : 

 

256 256 174

0.145 0.145 0.145

0 0 0 0 0 0 0 0 0 0 1 2 32 1 1 1 0 .

.

 

The remaining lines contain the voxel values as integers. When I start Gate
the voxel reader tells that it read 4371267 voxels only, yet the total
activity seems to be right. 

 

I also tried with interfile files. But here again the total number of voxel
is wrong whereas the activity seems right again. I use a linear translator
for the time begin for both method. 

 

I tried a hexdump on the binary file and I get the correct number of voxels
: 

 

> hexdump -ve  '1/2 "%u\t" "\n"' source.i33  | wc -l

11403264

 

The only way all these can be true is if there is a variable voxel size
which might implies a clustering of equal-valued voxels. But according to
the online documentation this is not yet implemented (Gate 6.0). 

 

I cannot see where I am wrong here.

 

Thank you, 

 

Emmanuel BRARD