Slide 6

This 30% dose isosurface was generated with a marching cubes algorithm. It clearly shows the shape of the beams. One problem with marching cubes is that calculation time is proportional to the number of volume elements (over 300K here). This can be slow - too slow for interactive response, such as turning a dial interactor with the surface growing/shrinking in real-time. Thus, strong incentive exists to reduce the dose volume complexity by spatially filtering it down into a smaller number of elements.

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