optimisation
disconnect between the aquisiation and the resulting image
cannot see optimisation from the image you need balance between iq and dose
as long as histogram contains all the data
you can window so no need for repeats or creep dose
system will compare
the histogram with an expected one on projection
exposure index range
a range you should achieve for that projection
deviation index
should be 0 any higher and expo is too high under and it too low