This is a set of macros for measuring the area of various regions in the corpus collosum in MRI scans. It assumes that the scans are 256x256, that you are using a 19" monitor, that the Undo buffer is set to 600K, and that you have a lot of RAM.
This is the procedure:
1) Open or activate the scan to be analyzed and type Z.
2) Draw a base line using the line tool.
3) Draw perpendicular lines by typing S or R.
4) Draw a perpendicular line at an arbitrary location by clicking