  Ultrasound is one of the most frequently used imaging modality in medicine.
The high spatial resolution, its interactive nature and non-invasiveness makes
it the first choice in many examinations. Image interpretation is one of
ultrasound's main challenges. Much training is required to obtain a confident
skill level in ultrasound-based diagnostics. State-of-the-art graphics
techniques is needed to provide meaningful visualizations of ultrasound in
real-time. In this paper we present the process-pipeline for ultrasound
visualization, including an overview of the tasks performed in the specific
steps. To provide an insight into the trends of ultrasound visualization
research, we have selected a set of significant publications and divided them
into a technique-based taxonomy covering the topics pre-processing,
segmentation, registration, rendering and augmented reality. For the different
technique types we discuss the difference between ultrasound-based techniques
and techniques for other modalities.
