Hi FreeSurfer experts,

 

I have recently been wondering about the correct unit for curvature and local gyrification index.

 

For curvature I find inconsistent information like:

mm^-2 (https://onlinelibrary.wiley.com/doi/epdf/10.1002/ima.20138, page 47),

but also that curvature values are expressed in degrees (https://www.sciencedirect.com/science/article/pii/S1053811905006543, page 1125).

 

For local gyrification index these papers make it seem like there is just not unit:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5397412/#:~:text=A%20large%20GI%20indicates%20a,was%20then%20extracted%20per%20region.

https://www.jneurosci.org/content/jneuro/31/19/7174.full.pdf

 

Which are the correct units?

Happy to get some expert input on this, thank you so much!

 

Best,

Lea

 

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Lea Backhausen

Ph.D. Student (M.Sc. Psychology/Neuroscience)

Department of Child and Adolescent Psychiatry, Faculty of Medicine of the TU Dresden, Germany
http://www.uniklinikum-dresden.de