This figure shows an example of rastering along the rotary axis. However, this can be used only for relatively slim objects, such as long connectors. In this example, without raster tomography a voxel size of 0.25 mm is achieved with 800 voxels per 200 mm of part length. To calculate a feature (e.g. a radius) several measurement points, and thus several voxels, are always required.  The smallest structures that can be practically measured in this example are about 1 mm to 3 mm in size. With quintuple rastering (five positions along the rotary axis), for example, about 4800 voxels are captured per 200 mm of part length with a voxel size of 0.04 mm.  The smallest structures that can be measured are thus approximately 0.15 to 0.5 mm.