[Insight-users] image spacing unit and anisotropic diffusion image filter

[Luis Ibanez]

Hi Feng,

The AnisotropicDiffusion filters will not take the
spacing into account.

If you consider this to be necessary, the best option
at this point is to resample your image in order to
get isotropic pixel spacing.

Right now, the results of applying anisotropic diffusion
will be the same, no matter what the pixel spacing values
are on the input image.

Including the pixel spacing as part of the PDE computation
will involve a performance penalty.



Regards,


   Luis




-----------------
Feng Ma wrote:
> Hi,
> 
>  I have a quick question about anisotrpic diffusion image filter: does 
> the image spacing measurement unit matter? e.g., will the result 
> different if I use millimeter or micro as image spacing unit?
> 
>  From software guide, I knew that for Gaussian smoothing, the sigma 
> should be in millimeter. I think that will require image spacing to use 
> millmeter also. Is that correct?
> 
>  Thanks.
> 
> -Feng
>