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Item VIRIM: A Massively Parallel Processor for Real-Time Volume Visualization in Medicine(The Eurographics Association, 1994) Günther, T.; Poliwoda, C.; Reinhart, C.; Hesser, J.; Männer, R.; Meinzer, H.-P.; Baur, H.-I.; Strasser, W.Architecture and applications of a massively parallel processor are described. Volumes of 256x256x128 voxels can be visualized at a frame rate of 10 Hz using volume oriented visualization algorithms. A prototype of the scalable and modular system is currently set up. 3D rotation around an arbilrary rotation axis, perspective, zooming, and arbilrary gray value mapping are provided in real-time. Multi user access over high-speed networks is possible. A volume oriented visualization algorithm is used that is tailored to the requirements in medicine [5]. With this algorithm, small structures of a size down to the pixel resolution, and structures without defined surfaces can be visualized as well as semi-trans parent objects. One application of the system is therapy planning in heart surgery.