you also have to be careful of differences in definition (e.g. is the fimbria part of the hippocampus?)
cheers, Bruce On Mon, 8 Jun 2009, Pedro Paulo de Magalhães Oliveira Junior wrote:
I think FreeSurfer has more reliability. In houndreds of manually segmented hippocampi we found FreeSurfer measures to be pretty stable.
the manually segmented hippocampi usually has 15% - 20% less volume. However we still don't know which method is more accurate. There's a study right now in USP to try to figure it out using the removed hippocampi.
If you need a local help (I mean in Brazil) you can write to my e-mail
2009/6/8, Flavio Seixas flseixas@yahoo.com.br:
My name is Flavio, student at Universidade Federal Fluminense. I research image segmentation methods applied to brain cortical structures segmentation.
I've compared against the hippocampal region got from FIRST-FSL to Freesurfer, using the same magnetic resonance (MR) image.
The FSL is a neuroimage analysis tool developed by FMRI group from Oxford. I found out a great volume difference between segmentations. Despite different automated image analysis tool, I was expecting a higher volume overlap index when comparing the same brain structure from the same MR image. I got about 25% volume overlap.
Is there any "recon-all" flag that I can use in conjunction with entire process so as to get better volume overlap? I would appreciate any suggestion.
Thank you in advance,
Flavio.