I’m looking into the 2nd moment of area of cross-sections of rodent incisors using .tif files. The shapes of these cross-sections are effectively ellipsoid and much taller than they are wide and the Imax and Imin results reflected this. Though the principal axes set by BoneJ were close in orientation to what I was interested in (the major axis was very very close to being perfectly cranial-caudal in orientation) I also used the orientation tool to set the orientation at 0.0 degrees as that is the direction the load will be coming from during a bite.
When I compared the results from the Imax and Imin with the ICrCa and IML I was surprised to find the results of the ICrCa and IML appeared swapped from what I would expect from what I’d seen from the Imax and Imin.
Bearing in mind the Cranial-Caudal axis was set to 0.0 I had expected it to show similar results to those from the major axis reported in the Imax. Is there something I’m missing that’s causing this? I expected some differences, but it’s almost as if I’d input the orientation to 90 degrees of what I actually selected.
Sorry for the essay!