Book excerpt: This practical textbook demonstrates for clinicians how sonography can assist in the diagnosis of gastrointestinal and hepatological illness. The main emphasis is on developments in sonography, including the application of echo contrast agents and the advantages of three-dimensional imaging. -- New concise yet thorough guide to novel techniques -- Provides a comprehensive survey of modern diagnostic strategy. -- Includes physical and technological principles of examination methods and all gastrointestinal diseases. -- Double page devoted to each clinical picture.