A macro for ImageJ which can be used to calculate flatness, symmetry and deviation for a radiation field. The field must be centred in the image and must not be at an angle, but can be of any size. The quantities are calculated according to the IEC 1989 standard, using a flattened area which again is user-definable.
For full details please see the user notes PDF document.
Please note that this macro is for educational use only and not for clinical applications.