Understanding CVD Output

[Tiffany Buu]

Hello,I am relatively new to cTakes, and am a bit confused on the purpose (and 
definition) of the SofaIndex, which is shown as a tab in the Analysis Results 
Section. I have read from other sources that a SofaIndex is a representation of 
an artifact. Can someone clarify the meaning of an artifact, and its importance 
in the SofaIndex?
Thanks,Tiffany Buu