* All the cosines will be -1, 0, or +1;
* "Patient Orientation" (deduced) will be "A/F".
* Positive X axis is oriented 'towards patient's nose
* All the cosines will be -1, 0, or +1;
* "Patient Orientation" (deduced) will be "A/F".
* Positive X axis is oriented 'towards patient's nose