Re: [Freesurfer] Spatial smoothing for cortical folding measures

2019-11-18 Thread Greve, Douglas N.,Ph.D.
Usually not for LGI. People usually don't use curv or sulc in group studies, so the question does not usually come up. For thickness, we usually use 5-10mm On 11/13/19 9:49 PM, huyang wrote: > > External Email - Use Caution > > Dear FS experts, > > Is it necessary to do spatial smoothing

Re: [Freesurfer] Spatial smoothing for cortical folding measures

2019-11-14 Thread Bruce Fischl
Hi Yang the size of the smoothing kernel depends on the size of the effect you are looking for (this is called the matched filter theorem), so there is no general smoothing size that is appropriate. We smooth a bit by default for visualization purposes, but you can pick any smoothing size you

[Freesurfer] Spatial smoothing for cortical folding measures

2019-11-13 Thread huyang
External Email - Use Caution Dear FS experts, Is it necessary to do spatial smoothing for cortical folding measures (curv/sulc/smoothwm.FI.crv/pial_lgi, etc.)? These cortical folding measures are inherently smooth based on the computation methods used. If spatial smoothing is