[Gate-users] Hounsfield units

[zahra ahmadi]

Dear all
I have a CTimage of the head and I want to import it to my Gate program.  I have calculated the Hounsfield units basedon the material compositions and it starts from negative values.  When I check my CT image by MATLAB to see theHounsfield units on the image, these units start from zero, and when I checkwith Amira software, it starts from negative values.  Do I have to start with negative units ​​or I should shift these values and start from zero to use them ​​in the gate program? What do you suggest to me to make sure I choose the right way to use in my gate program?
Bestregards

Zahra

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