[Insight-users] RE: [Insight-developers] itkOrientedImage type definition

[Lorensen, William E (Research)]

Good point. I'll have to check.

-----Original Message-----
From: Gordon Kindlmann [mailto:gk at bwh.harvard.edu]
Sent: Thursday, August 18, 2005 4:19 PM
To: Lorensen, William E (Research)
Cc: " " <insight-users at itk.org>; Insight-developers (E-mail)
Subject: Re: [Insight-developers] itkOrientedImage type definition



If the orientation information came from Analyze or NIFTI, is it  
converted to LPS?

Gordon

On Aug 18, 2005, at 4:08 PM, Lorensen, William E (Research) wrote:

> I believe that the direction cosines in ITK are always in LPS. I  
> just copy in the dicom direction cosines.
>
> Bill
>
> -----Original Message-----
> From: insight-developers-bounces+lorensen=crd.ge.com at itk.org
> [mailto:insight-developers-bounces+lorensen=crd.ge.com at itk.org]On  
> Behalf
> Of Simon Warfield
> Sent: Thursday, August 18, 2005 3:01 PM
> To: insight-users at itk.org; insight-developers at itk.org
> Subject: [Insight-developers] itkOrientedImage type definition
>
>
>
> I am looking at the documentation that describes directions here:
> http://www.itk.org/Doxygen/html/classitk_1_1Image.html#w14
>
> This indicates that there is the possibility to represent a matrix of
> direction cosines.
> Direction cosines represent the angle between two sets of basis  
> vectors.
> http://mathworld.wolfram.com/DirectionCosine.html
>
> In order to understand what the orientation of an itkOrientedImage is,
> there must be some way to specify or to record what those basis  
> vectors are.
> For example, the definition of DICOM direction cosines warrants that
> what is being provided is the angle between the patients anatomy in  
> what
> is referred to as the Left-Posterior-Superior orientation and the  
> image
> columns and rows.
>
>   With respect to what are the ITK direction cosines computed ?  If it
> is not specified then the orientation of an image containing such
> direction cosines is still unknown, which would defeat the purpose of
> providing an orientation.
>
> --
> Simon
>
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