[Insight-users] Bias-Correcting images

[Arne Hansen]

Hey Martin
Thank you for your input.
I have been looking at FAST and it looks good. The only problem is that this
program only makes BIAS-correction for a single image which is also good.
But i have a series of image where i want the intensities to correspond
across images, so
that graymatter in image 1 has more or less same probability distribution as
in image 2 and 3 and 4 etc. And the same with WM and CSF etc.

Do you see what i mean?
Thank you


2007/3/20, Martin Kavec <kavec at messi.uku.fi>:
>
> 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...
> >
>
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