[MINC-users] Blurring with noise and/or sharp edges

[David Wack]

You might try what I call masked smoothing.

http://bmcmedimaging.biomedcentral.com/articles/10.1186/1471-2342-14-28

I used it to smooth separately vessels and tissue in CT, but it works
just as well for any mask.    If I remember correctly you just need to mask
the
image, then smooth, then correct using the same smoothing applied to the
mask.



d

On Mon, Oct 24, 2016 at 1:33 PM, Louis Collins, Dr. <louis.collins at mcgill.ca
> wrote:

> Gabriel,
> How about denoising first, then blurring?
> -Louis
>
> > On Oct 24, 2016, at 1:29 PM, Gabriel A. Devenyi <
> gabriel.devenyi at mcgill.ca> wrote:
> >
> > Hi all,
> >
> > I have some data I'd like to blur which has "nonsense" voxels outside the
> > brain (MP2RAGE maps). I want to exclude these voxels from the blur. If I
> > zero out these voxels I get an edge effect, the apodizing doesn't help as
> > much as I'd like it to.
> >
> > Is anyone aware of an alternate blurring method which can avoid these
> > issues?
> >
> > Thanks.
> >
> > --
> > Gabriel A. Devenyi B.Eng. Ph.D.
> > Research Computing Associate
> > Computational Brain Anatomy Laboratory
> > Cerebral Imaging Center
> > Douglas Mental Health University Institute
> > McGill University
> > t: 514.761.6131x4781
> > e: gabriel.devenyi at mcgill.ca
> > _______________________________________________
> > MINC-users at bic.mni.mcgill.ca
> > http://www.bic.mni.mcgill.ca/mailman/listinfo/minc-users
>
> _______________________________________________
> MINC-users at bic.mni.mcgill.ca
> http://www.bic.mni.mcgill.ca/mailman/listinfo/minc-users
>



-- 
David S. Wack, PhD
Research Associate Professor
Dept. of Nuclear Medicine
University at Buffalo

tel:      716 838-5889 ext 152
cell:    716 319-4853
email: dswack at buffalo.edu
or     : dswack at gmail.com