[Insight-users] Vital DICOM information/tags when registering images?

[Bill Lorensen]

You should get the same answers. Exactly what filters are you using in
each of the cases. I can't tell from your description.

Bill

On Tue, Sep 15, 2009 at 4:38 PM, Patrik Brynolfsson
<patrik.brynolfsson at gmail.com> wrote:
> Hello,
> I'm working on a Matlab mex-implementation of an ITK registration. This
> means that instead of loading the images from files I will load them from
> memory as 3D matrices. All the DICOM information needs to be passed to ITK
> from Matlab as well, and this is where my problems begin. The information
> that I thought was essential for a correct registration is:
> * Origin
> * Spacing
> * Direction
> I set these using the "ChangeInformationImageFilter" and it is working; the
> images have the origin, spacing and directional cosines that are assigned to
> them, and they are the same as if the dicom images were loaded from files.
> However, the result of the registration is different from that when loading
> the images from files, with all other components set the same, (of course I
> reinitialize the seed). Not by much, but they should be exactly the same! I
> use Mattes mutual information metric, linear interpolation, Versor rigid 3D
> transform and the accompanying Versor rigid 3D optimizer together with the
> "CenteredTransformInitializer".
> I know that the difference in results are due to the way I read the data. If
> I change the input from memory to reading the dicom files I get the same
> result as with a stand-alone .exe-application, so this is where the error
> is.
> Does anyone have any idea as to what other information I need to pass from
> matlab to get identical results?
> Thanks in advance
> --
> Patrik Brynolfsson
>
>
>
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