Diapositive 1

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Cross sections are scaled by mass density
Σ – cross section for a medium represented by mass density,
– mass density in the patient ( =1)
Σ – cross section for water
[ ( )/ ] is the correction function which is always equal to unity for water.
Some additional considerations may be present in certain situations
Dublin 2018
19
Σ = [ ( )/ ] ∙ ∙ Σ