This book focuses on the application of Three Dimensional (3D) and Real Time Three Dimensional (4D) ultrasound in Obstetrics and Gynecology. It is important to emphasize that while 3/4D ultrasound technology offers a host of advantages, it does not replace the essential role of traditional 2D ultrasound. This book serves as a valuable resource for aiding in the selection of the most appropriate imaging modality. The approach of providing side-by-side comparisons of 2D and 3D ultrasound images enhances the clarity of specific clinical scenarios where the 3/4D technique confers indisputable benefits. Furthermore, proficiency in acquiring and manipulating volume data is crucial for mastering 3/4D ultrasound technology. Therefore, comprehensive, step-by-step tutorials on the acquisition and interpretation of 3/4D ultrasound images in OB & GYN are essential. While 3/4D ultrasound may generate heightened expectations among practitioners, it should be deployed judiciously, withclinical relevance firmly established. To this end, presenting diagnostic challenges that prompt readers to apply their knowledge of 3/4D ultrasound in problem-solving scenarios proves invaluable in guiding operators in clinical practice. This book aims to bridge the divide between theory and practical application, elevating the standard of education in ultrasound for Obstetrics and Gynecology, ultimately enhancing patient care in this field.