1. No, we usually do wm edits/control points first as this can fix the pial problems.
2. You can put control points in any voxel that is clearly WM with no other tissue class partial-volumed into it. The intensity threshold depends on the MR sequence, where you are in the brain and possible pathology/developmental/aging effects
cheers Bruce
On Thu, 18 May 2017, Caroline Beelen wrote:
Dear FS team,
I have two questions regarding manuel editing. We were looking at inter-rater reliability, but noticed it was not too high... However, during editing we used different criteria. Therefore I would like to ask:
1. Does the order of pial correction, topological deficit, wm corrections and control points editing matters? You seem to assume on your website for instance that pial corrections would come before wm corrections/control points, but is this necessarily the case?
2. When the wm intensity value is below 110, voxel inclusions might be needed. On the website is written: “when you feel like there is wm underneath you can add control points (…)”. How to make a decision on this matter: based on sight or on wm intensity values?
For instance, often the WM values are either 0 or 80 or above... Would it be good to assume that wm intensity values above 80 are actually wm, regardless of how it visually would look like? Likewise, would it be good to assume that areas where it says the wm intensity value is 0, that these areas are actually not wm, regardless of whether it might look like wm? So, basically, it is correct to make your decision only based on wm intensity values?
Thank you for your reply.
Kind regards,
Caroline Beelen