@inproceedings{bakalash1992extended,
  title={An Extended Volume Visualization System for Arbitrary Parallel Projection.},
  author={Bakalash, Reuven and Kaufman, Arie E and Pacheco, R and Pfister, Hanspeter},
  booktitle={Eurographics Workshop on Graphics Hardware},
  pages={64--69},
  year={1992},
  abstract={We present a special architecture for arbitrary parallel projection for visualization of volumetric data. Using a ray-casting technique, parallel memory access, and pipelined processing of rays in a composition tree, we can achieve interactive rendering rates for a 5123 dataset.}
}