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(a) Pulp-Dentin Boundary (b) Dentin Interior (c) Dentin Boundary
Figure 4: Probing and Dual-Domain Interaction: (a) shows probe at the pulp-dentin boundary. Notice the arc formed by the re-projected voxel in the transfer function widget. (b) shows the probe passing through the dentin interior. The boundary between dentin and background is shown in (c); the re-projected voxel again forms the arc characteristic of a clean boundary. In (a) and (c) dual-domain interaction allowed "painting" localized regions of opacity.

(a) Bone Emphasized (b) Probe in Soft Tissue (c) Skin Emphasized
Figure 5: Direct Manipulation Widgets: bone surface in (a) is visualized using a triangular classification widget, skin is captured using the data probe at the boundary between air and skin, while a clipping plane exposes a slice of the data and the interior of the skull. In (b), the probe is within the soft tissue interior. The transfer function in (c) demonstrates the results of dual domain interaction using the surface of the clipping plane for probing.

(a) Whole Volume (b) With Cutting Plane
Figure 8: Results of using the "default" 3D transfer function. The skin and surrounding material are visible in (a); the cutting plane in (b) shows that the skull and teeth were also emphasized. Changing hue linearly with data value helps distinguish between different material boundaries.

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Next: Bibliography Up: Interactive Volume Rendering Using Previous: Acknowledgements