Volume data and geometric objects

• volume informations come from MRI scanners or computertomographs and contain information about the density of materials at discrete measured positions. Volumeinformations represent discrete values in 3 dimensions - like a bitmap does in 2 dimensions.

• geometric objects exist in computer as a kind of formulas. Usually, they are triangles, polygons or CSG-trees which will be used to show a medical knife, for example.

It is possible to convert data from one form into the other. We can extract volumedata from geometric objects easily, but then the resolution is fixed and a coarse visualization may occur. It is more difficult to generate geometric objects from volume data, because these objects are not always unique.

Highest possible image quality can be produced by hybrid data. This is a merged form, which contains each data structure in its original kind as long as possible.

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