[Gate-users] How to use XCAT-attenuation information in Gate

[Marc Chamberland]

Hi Wei,

The attenuation range does not give the actual attenuation coefficients. Read the user's guide: http://wiki.opengatecollaboration.org/index.php/Users_Guide_V7.0:Voxelized_Source_and_Phantom#Conversion_into_material_definitions

The first two numbers on a line represent the range of voxel values for which the voxel will be assigned the material on the line (so Gate knows the attenuation coefficients by knowing what material the voxel is). The last four numbers on the line are simply the visualization parameters, i.e. what color this specific material will be on the screen and how transparent it will be. It has nothing to do with the attenuation coefficients.

I hope this helps.

Cheers,
Marc



__________________________

Marc Chamberland, MSc
PhD candidate
Department of Physics
Carleton University
Ottawa (ON)

On May 19, 2014, at 9:30, Wei Deng <wdeng at oakland.edu<mailto:wdeng at oakland.edu>> wrote:

Hello, gaters. There is a question when I am studying the voxelized phantom. It read 'AttenuationRange.dat' to form the attenuation map in VoxelizedPhantom.mac in the examplePET. However the last column of 'AttenuationRange.dat' is not discripted as 'attenuation coefficient' but 'Tansparency'. Who can tell me the relationship between 'attenuation coefficient' and 'Tansparency'? Should I replace the 'Tansparency' with my 'attenuation coefficient' when forming the attenuation map?
My phantom was created by XCAT. Is there any documentation (or are there examples) for integrating XCAT-phantom
attenuation data into a gate simulation?

thank you so much for your attention.
Best regards,

Wei
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