Hi,
I also discovered recently that fast v417 behaves differently than fast v353. Although I don't have a lot of experience in manually segmenting MRI images, I think, based on the attached image collage, that the WM mask from fast v417 (2nd image from right) has rather a lot of holes in it. I compared it with the WM mask from fast v353 (4th image from right) but also with the WM mask after I removed the bias field with v353 and segmented the restored image with v417 (3rd image from right). Personally, I find that the 3rd image from right (bias field corr. v353, segm. v417) looks a bit better than the others... so I think that the bias field correction of v417 is problematic in my case. Can you give me a hit how I could improve it?
Thank you.
Andreas
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