[Insight-developers] orientation

[Torsten Rohlfing]

Small correction to my previous post:

> 2. coordinate space is changed to RAS. That does not affect the storage
> order of image pixels, but it changes the direction cosines by
> permutation and negation. As an example, "LPS" to "RAS" means x becomes
> -x, y becomes -y, and z stays z. This also applies to the coordinate
> space origin. Different example: "ARS" to "RAS" means first and second
> direction vector are exchanged.

The last sentence is wrong; correct is: "ARS" to "RAS" means that x and
y elements are swapped in all direction vectors and also in the space
origin.

TR

-- 
Torsten Rohlfing, PhD          SRI International, Neuroscience Program
 Research Scientist             333 Ravenswood Ave, Menlo Park, CA 94025
  Phone: ++1 (650) 859-3379      Fax: ++1 (650) 859-2743
   torsten at synapse.sri.com        http://www.stanford.edu/~rohlfing/

     "Though this be madness, yet there is a method in't"