[Insight-users] 3d multi-modality registration

[Grace Chen]

Hi Luis,  Thanx a lot for your inputs!

I've been struggling with this one for a longest time....  The problem is
that I have two 3D brain images and one brain image has greater physical
extents in z.  The information of the two volumes are as follows:

Fixed image:
  origin = [-120, -135.805, -29.7683]
  spacing = [0.9375,  0.9375,  7]
  extent = [256,256, 7]

Moving image:
  origin = [-142.5, -170.488, -84.8781]
  spacing = [1.17188, 1.17188, 5.5]
  extent = [256,256, 28]

For these two brain volumes, the fixed image matches a section in the moving
image...I tried registered them using the whole volume, the first slice of
the registered moving image doesn't looked like that of the fixed image at
all...Then, I tried extracting a section from the moving slice and
registered them together....but the middle slices of the the registered
image does not match the corresponding slices in the fixed image.  What's
going on??  Is there prerequisite on the input data for performing
mullti-modality registration using ITK?

Please help!!  I am in deperate need to really nail this this time!!  Thanx
a million!!

Grace

----- Original Message ----- 
From: "Luis Ibanez" <luis.ibanez at kitware.com>
To: "Grace Chen" <Grace.Chen at swri.ca>
Cc: <insight-users at itk.org>
Sent: Thursday, May 25, 2006 9:58 PM
Subject: Re: [Insight-users] 3d multi-modality registration


>
> Hi Grace,
>
> In principle, that's true,
>
> but in practice it may not happen if the spatial extension
> of the moving image doesn't fully overlap with the fixed
> image.
>
> Have you checked the other slices ?
>
> Do they overlap well ?
>
>
>      Luis
>
>
> ===================
> Grace Chen wrote:
> > Hi there,
> >
> > My program performs the 3D multi-modality registration for two volumes.
> > After the registration has been performed, is it true that the first
> > slice of the registered moving image should look like the first slice of
> > the fixed image?
> >
> > Grace
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
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> > Insight-users at itk.org
> > http://www.itk.org/mailman/listinfo/insight-users
>
>