Re: [Freesurfer] pctsurfcon question

Yes, that was actually a mistake on my part. It does go between -200 and +200. doug

On 10/16/2012 11:02 AM, Phil Greer wrote:

I do not have a question on how to use the program, the wiki covered that well.

My question is about the formula embedded in the program to calculate the contrast.

The formula is ((wm-gm)/((wm+gm)/2))*100

This creates a dynamic range of -200 to +200. Which the last time I checked is not really a percent as the command name implies.

Was there some reasoning behind this that I am missing?

Phil Greer University of Pittsburgh _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer