Abstract
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.
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References
Levoy, M.: Display of surface from volume data. IEEE Computer Graphics and Applications 8(3), 29–37 (1988)
Hong, L., Kaufman, A., Wei, Y., Viswambharan, A., Wax, M., Liang, Z.: 3D Virtual Colonoscopy. In: IEEE Symposium on Biomedical Visualization, pp. 26–32 (1995)
Sabella, A.: A rendering algorithm or visualizing 3D scalar fields. Computer Graphics 22(4), 51–58 (1988)
Wang, G., Vannier, M.W.: GI tract unraveling by spiral CT. In: Proceedings SPIE, vol. 2423, pp. 307–315 (1995)
Wang, G., Dave, S.B., Brown, B.P., Zhang, Z., McFarland, E.G., Haller, J.W., Vannier, M.W.: Colon unraveling based on electrical field: Recent progress and further work. In: Proceedings SPIE, vol. 3660, pp. 125–132 (1999)
Vilanova, A., Wegenkittl, R., Kőnig, A., Grőller, E., Sorantin, E.: Virtual colon flattening. In: Proc. VisSym 2001 Joint Eurographics – IEEE TCVG Symposium on Visualization, pp. 127–136 (2001)
Vilanova, A., Wegenkittl, R., Kőnig, A., Grőller, E.: Nonlinear Virual Colon Unfolding. In: IEEE Visualization (VIS), pp. 411–579 (2001)
Lee, H.J., Lim, S.H., Shin, B.S.: Unfolding of Virtual Endoscopy Using Ray-Template. In: Oliveira, J.L., Maojo, V., MartÃn-Sánchez, F., Pereira, A.S. (eds.) ISBMDA 2005. LNCS (LNBI), vol. 3745, pp. 69–77. Springer, Heidelberg (2005)
Lorensen, W.E., Cline, H.E.: Marching Cubes: A high resolution 3D surface construction algorithm. In: Proceedings SIGGRAPH, pp. 163–169 (1987)
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Ahn, H., Shin, BS. (2006). Height-Based Deformation and Ray Supersampling for Colon Unfolding. In: Pan, Z., Cheok, A., Haller, M., Lau, R.W.H., Saito, H., Liang, R. (eds) Advances in Artificial Reality and Tele-Existence. ICAT 2006. Lecture Notes in Computer Science, vol 4282. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11941354_114
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DOI: https://doi.org/10.1007/11941354_114
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