[Insight-users] Orientation Information

Luis Ibanez luis.ibanez at kitware.com
Wed Aug 27 08:25:26 EDT 2008

Hi Luke,

Please start by looking at the diagrams


The blue tubes on the right side are representing
the bones in the right leg of a patient.


The X axis points to the patient's left side
The Y axis points to the patient's back
The Z axis points to the patient's head

This coordinate system is considered to be the base
coordinate system.

Images acquired in this form will have a Direction
Matrix equal to Identity.

Image acquired in a different orientation, will have
a Direction matrix containing the components of the
image axis expressed in term of this base coordinate



Luke Bloy wrote:
> Hi can some one explain what Image->GetDirection() will return. My 
> understanding is that it returns the axes directional cosigns, but i am 
> unsure what coordinate system they are expressed in? reading this 
> http://www.itk.org/Wiki/Proposals:Orientation has left me more confused.
> -thanks
> Luke
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