ABSTRACT
Three-dimensional (3D) sonography should be accepted as a natural development of ultrasound imaging technology. Fast computer processing is essential for 3D and 4D sonography. Due to rapid developments in computer and transducer technology, image quality, number of volume applications, and processing speed have improved significantly. With the machines presently available, volume acquisition and volume display can be achieved in such a way that the fetus can be visualized three-dimensionally in real time providing highly realistic fetal images. Additional 3D/4D techniques with clinical applications have been developed, allowing combinations between different modalities of volume sonography. We will review them in detail in this chapter.
