[Insight-users] Re: [vtkusers] Bias-Correcting images

[Luis Ibanez]

Hi Arne,


You may want to take a look at the filter:

     itkMRIBiasFieldCorrectionFilter.txx

http://www.itk.org/Insight/Doxygen/html/classitk_1_1MRIBiasFieldCorrectionFilter.html


You will find an example on the use of this filter at:


       InsightApplications/MRIBiasCorrection



For more details please refer to the following articles:

"Parametric estimate of intensity inhomogeneities applied to MRI"
Martin Styner, Guido Gerig, Christian Brechbuehler, Gabor Szekely,
IEEE TRANSACTIONS ON MEDICAL IMAGING; 19(3), pp. 153-165, 2000,
(http://www.cs.unc.edu/~styner/docs/tmi00.pdf)


"Evaluation of 2D/3D bias correction with 1+1ES-optimization"
Martin Styner, Prof. Dr. G. Gerig (IKT, BIWI, ETH Zuerich),
TR-197 (http://www.cs.unc.edu/~styner/docs/StynerTR97.pdf)



   Regards,



       Luis



------------------
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...
> 
> 
> ------------------------------------------------------------------------
>