Different data will give different results. The fact that your
results differ slightly is entirely expected.
The difference comes from the fact that one image is nonuniformity
corrected, which will have a slight influence on the initial affine
registration, as well as on the bias correction part of the
segmentation model. Bias correction is regularised, so the result of
doing it twice will be different from doing it just the once.
Best regards,
-John
2010/9/30 Joćo Duarte <[log in to unmask]>:
> Hello to all.
>
> Following my e-mail yesterday, I did the segmentation of one T1 image
> using both the native space image and the bias corrected image. Then I
> checked the GM and WM segmented images and the results are different
> when using the native space or the bias corrected image. Also the
> pxxx_seg8.txt have different values for GM, WM and CSF volumes (by the
> way, are these values in ml?) when using the 2 different images in
> input... Can someone help me to understand the difference, is this
> normal?
>
> Thank you in advance
>
> JD
>
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