In this episode, we dissect the controversy surrounding contrast-induced nephropathy (CIN) and modern IV contrast dye.  Dr. Thomas Ulmer joins us to look at the science and history of IV contrast and CIN.    Turn down your lights, get out your collection of vintage CT scout films, and listen in as we discuss whether it's safe to scan that suspected dissection with a creatinine of 5 or in Hugh's case that mild gastroenteritis with a GFR of 35.