I'm a student and was wondering how the EI numbers work. For Quantum model x ray machine the EI shows up colored what do they mean -Red number, - orange, - green, +green number, +orange, +red number and so on I don't set technique, this part hasn't been explained what number means over vs under exposed for a Quantum model machine? submitted by /u/Velociraptopensdoor [link] [comments] source https://www.reddit.com/r/Radiology/comments/utu1x7/ei_colors/