[Insight-users] What is the current status on image orientation etc?

[Bill Lorensen]

itkImage takes into account the direction cosines that exist in the
dicom header. Meta image and nrrd both respect the direction cosines.
The documentation is a bit out of sync.

Bill

On Fri, Mar 5, 2010 at 5:12 AM, Kris Thielemans
<kris.thielemans at csc.mrc.ac.uk> wrote:
> Hi
>
> I apologise for asking this question, but I have been trying to get my head
> round image orientations and location, but haven't succeeded.
>
> Can anyone point me to a page/document describing the current (i.e. ITK
> 3.16) status of the conventions used by ITK for the coordinates returned by
> e.g. TranformIndexToPhysicalPoint?
>
> I am mainly interested in the question that if I read an image from Dicom,
> and another from e.g. MetaIO, where both specify PatientPosition in there
> respective conventions, would the ITK "physical coordinates" live in the
> same coordinate system, and how is it related to the patient?
>
> I did find the discussion page on
> http://www.itk.org/Wiki/Proposals:Orientation but this is last updated in
> 2007 and it doesn't seem to contain the decisions taken. There's also the
> bug thread http://www.itk.org/Bug/view.php?id=6558 which is now closed. I
> infer from it that ITK now uses centre-of-voxel, but it isn't very clearly
> stated. There's also some discussion for ITK 4.0, but that doesn't help me
> yet.
>
> Thanks
>
> Kris Thielemans
> Hammersmith Imanet Ltd
>
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