Compute MGH volume orientation string.
Arguments
- header
Header of the mgh datastructure, as returned by
read.fs.mgh.
Value
character string of length 3, one uppercase letter per axis. Each of the three position is a letter from the alphabet: LRISAP?. The meaning is L for left, R for right, I for inferior, S for superior, P for posterior, A for anterior. If the direction cannot be computed, all three characters are ? for unknown. Of course, each axis (L/R, I/S, A/P) is only represented once in the string.