We would like to express our warmest appreciation to the chapter authors for their commitment and hard work in helping to produce this textbook. We also would like to thank them for helping us collect more than 1000 figures. We would like to thank Lori Green and Gulfcoast Ultrasound for their support of this project and for providing us with ultrasound images from their library. We are indebted to a number of individuals who assisted us with this project; in particular, we would like to thank Kay Conerly, Christie Naglieri, Sarika Gupta, and Catherine Saggese for their invaluable contributions.