[ITK] CBCT projection data

[Atallah Baydoun]

Sorry for the question but I am starting to process CBCT data from Elekta
XVI.
I was able to read the .his file.
I have applied the formula:

I/I0= 1- Projection/65535

One problem is that even when *no attenuation is expected* the matrix is
returning *positive values instead of 0 ?*

Does anyone have any thought about it ?

Thank you,
Atallah
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