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

[Alex Yarmarkovich]

It looks that in ITK2.2 release the image orientation cosines coming 
from NRRD reader are in the original coordinate system defined in NRRD 
header, not LPS.

Alex


Lorensen, William E (Research) wrote:

>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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>>    
>>
>
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