Small animal diagnostic ultrasound [electronic resource] / John S. Mattoon, DVM, DACVR, Consultant, Adjunct and former Professor of Radiology, Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, Washington, Thomas G. Nyland, DVM, MS, DACVR, Professor Emeritus, Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, Davis, California.