Marching cubes: A high resolution 3D surface construction algorithm
SIGGRAPH '87 Proceedings of the 14th annual conference on Computer graphics and interactive techniques
Display of Surfaces from Volume Data
IEEE Computer Graphics and Applications
A rendering algorithm for visualizing 3D scalar fields
SIGGRAPH '88 Proceedings of the 15th annual conference on Computer graphics and interactive techniques
Nonlinear virtual colon unfolding
Proceedings of the conference on Visualization '01
BIOMEDVIS '95 Proceedings of the 1995 Biomedical Visualization (BioMedVis '95)
Unfolding of virtual endoscopy using ray-template
ISBMDA'05 Proceedings of the 6th International conference on Biological and Medical Data Analysis
EGVISSYM'01 Proceedings of the 3rd Joint Eurographics - IEEE TCVG conference on Visualization
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Virtual colon unfolding is a method to produce an unfold image from volume data. The previous method generates only 2D images casting rays from a central path toward the colon surface and maps the color value into 2D regular grid. However, since rays cannot be reached behind folds, some regions are not represented on the final image. In order to represent those areas adequately, we exploit a height field derived from ray casting. Since the problematic areas have high gradient in comparison to neighboring regions, the differences of height value in those areas are relatively large. Therefore, we can find problematic areas using the height field. To visualize those areas, we exploit supersampling method that casts additional rays toward perpendicular direction of the original rays. Experimental results show that our method represents colon folds accurately.