Tag Archives: radiation

Problems with Exposure Index (EI) Numbers

When Fuji first developed CR back in the early 80’s, they were also the first company to invent an Exposure Index (EI) number system.  As most of us know, they went with S numbers and decided to have those numbers correspond with the speed of film –screen systems so that the higher

Off-Focus Radiation

This whole project began when we tried to prove if a patient should be shielded in the front or the back for a PA chest x-ray. I decided to test this out using an 8×10 CR cassette that I would run at 1200 speed, making it extremely sensitive to any