[Rtk-users] RTK calculating attenuation from Varian projection

[Andy Shieh]

Hi Simon,

I was looking at "rtkVarianObiRawImageFilter.h", and realized that the
attenuation is calculated from the projection image simply via a negative
transformation (1-Intensity/HND_MaxIntensity).
Is it usually the way this is done, and is there any reason for doing this?
I would have thought attenuation should be calculated from intensity via
logarithm (since I=I_0 exp(-mu x)).
Thanks!!

Cheers,
Andy
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