For those of you having problems with mathematical formulas (or little motivation), here is a quiz that goes a little bit more into the right brain.
I have taken photographs of some members of our team (A to I) and converted them to DVA files. To make the quiz a little bit more tricky, only one eye was converted into a sliding window (1 to 9). To make it even more tricky, not the mathematical fluence is shown, but the result on radiographic film, after scanning the film with a Lumisys laser scanner.

Find the matching pairs!

Same rules, same prize!

First the photos that were used as input fluence:

And here one eye of each face (Kodak XOMAT-V film):