[Insight-developers] [GDCM] ITK Origin and coordinate system

[Bill Lorensen]

In your experiment you must use an itkOrientedImage, not an itkImage. Is 
that what you used?

Bill

At 08:13 PM 1/17/2006, Peter Cech wrote:
>On Tue, Jan 17, 2006 at 18:06:02 -0500, Bill Lorensen wrote:
> > In an experiment I did a few months back, I had 6 MR scans done of the 
> same
> > object in each of the 6 orthogonal directions. I read them in using the
> > current GDCMImageIO  (which transforms the origin using the direction
> > cosines). All of the volumes roughly lined up without any additional
> > transformations.
> >
> > If I did not apply the direction cosines, the datasets were all shifted.
>
>I got several MRI scans of head, the same scanning sequence, but taken
>at various times over last half-year. My experience is exactly opposite
>to yours. With directional cosines applied to origin, there alignment
>was very poor (cca. 10cm shift, both in I-S and A-P direction). Today I
>tried without directional cosines applied to origin and they aligned
>much better, maximum shift was around 5cm and only in S-I direction.
>
> > Go figure,
>
>Yes, go figure...
>
>Regards,
>Peter
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