[Insight-users] Mattes MI: "Too many samples map outside..."

[Karthik Krishnan]

That's odd.

Is the moving image a lot smaller than the fixed image ? Samples are taken
from the fixed image. If the moving image is a lot smaller, that could
explain their mapping outside the moving image region.

-karthik


On 2/12/07, Xabier Artaechevarria Artieda <xabiarta at unav.es> wrote:
>
> Hi Karthik,
> Thanks for your answer.
> I just set the maximum number of iterations to 174 and applied the
> resulting transform to the moving image. Comparing it to the fixed
> image, the overlapped seemed good.
> I tried changing the number of spatial samples (from 1/10 to 1/9) and
> now the registration is working fine. I must admit I do not really
> know why.
> Regards,
> Xabi
>
>
>
>
> Karthik Krishnan <karthik.krishnan at kitware.com> ha escrito:
>
> > On 2/9/07, Xabier Artaechevarria Artieda <xabiarta at unav.es> wrote:
> >>
> >> Hallo Christoph,
> >> Thanks for the answer.
> >> I checked after 174 iterations and the overlap seems in fact good,
> >
> >
> > How did you ascertain the fact that the overlap is good ? (I presume you
> > checked the transform, but I don' tsee it printed in the log). There
> must be
> > a significant drift in teh transform from teh initial position to the
> > position after 174 iterations to prompt this error.
> >
> > DId you try resampling with the transform and overlaying the images to
> make
> > sure that the transforms are headed in the right direction ?
> >
> > and
> >> it is considerably better than at the first iteration. Do you think I
> >> could solve the problem by using a higher number of spatial samples?
> >> Now I am using one tenth of the total voxels.
> >
> >
> > 1/10th for MI is plenty.
> >
> >
> >>
>
>
>
> ----------------------------------------------------------------
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