This textbook serves as a comprehensive guide to the use of color Doppler imaging across various medical specialties, including radiology, obstetrics, gynecology, and echocardiography. It aims to provide clear, concise knowledge about diagnosing diseases using color Doppler imaging, addressing the needs of postgraduate residents, practicing physicians, radiologists, and obstetricians/gynecologists. This edition has been updated to reflect technological advances and meet the increasing demand for this critical diagnostic tool.