Hi,

It generally isn't very critical to use bias-corrected images with
FIRST as it does local comparisons, but if there is substantial
bias field in the image then it is likely to help if you can get rid
of it beforehand.

As for SIENAX, the bias-correction is built into the FAST
segmentation.

All the best,
Mark

On 4 Aug 2009, at 19:17, Buyean Lee wrote:

> Hi FSL users,
>
> I wonder if anyone knows if one needs to use field-bias-corrected > images in FSL FIRST.
> In addition, I would like to know how if SIENAX includes field bias > correction.
>
> Thank you,
>
> Buyean
>