[Insight-users] Bias-Correcting images

[Martin Kavec]

Hi,

I suppose you just was to correct the images and not to play around with 
different bias-field correction methods. For this, try FAST (never 
failed me), which is a part of freely available FSL. Just go to

http://www.fmrib.ox.ac.uk/fsl/fast/index.html

Hope this helps.
Martin

On Tue, 20 Mar 2007, Arne Hansen wrote:

> Hello. I have 13 MR-images which have been individually bias-corrected using
> a program called N3(Sled, Zijdenbos, & Evans, 1998)
>
> The problem is that the intensities vary across the images, which is very
> unfortunate, because i am making a segmentation based on intensity
> distributions.
> So I need to correct the images, so that they have same intensity for
> graymatter, same for whitematter, csf etc.
> I have tried just to add a factor to each image found by
> factor=mean(allimages)-mean(currentimage)
>
> This did not have the wanted effect however. Are there better ways of doing
> this?
> Thank you very much.
> Regards...
>