The Authors M.C. Muhlbauer, DVM, MS, DACVR is a veterinary radiologist with over 30 years of experience in teaching and performing diagnostic imaging. He is owner and president of Veterinary Imaging Specialists in Venice, Florida, USA. S.K. Kneller, DVM, MS, DACVR retired as Associate Professor Emeritus from the University of Illinois College of Veterinary Medicine in Urbana in 2007 after over 32 years and since then has served as Locum Tenens at eight different North American veterinary colleges and as Adjunct Instructor at Midwestern University College of Veterinary Medicine, Glendale, Arizona, USA.