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1 A Study on the Automation of Classification of Volume Reconstruction for CT Images S.M. Park 1, I.S. Hong 2, D.S. Kim 1, D.Y. Kim 1 1 Dept. of Biomedical Engineering, Yonsei University, 2 Dept. of Radiology, Wonju Christian Hospital = Abstract = The 3D volume rendering which transforms two-dimensional images into a three-dimensional (3D) object, is widely used to diagnose in many clinical applications. Since 1980 s, the researches of 3D volume visualization have been proceeded with rapid advances in computer graphics. Today, 3D visualization can be implemented interactively on PC. One of the popular technique for presenting 3D structure is a volume rendering which is widely used in medical imaging research areas. The classification step in the 3D volume rendering pipeline requires us to classify regions of interest in a data set. In this paper, we proposed the classification functions from the features of histogram morphology in the transformed data, which automates the classification of 3-D volume rendering efficiently. Key words: Volume rendering, Classification, Histogram, 3-D, Reconstruction, Ray-casting, Shear-warp factorization

applications. Since 1980 s, the researches of 3D volume visualization have been proceeded with rapid advances in computer graphics. Today, 3D visualization can be implemented interactively on PC.

2 Fig. 1. Fig

3 CT vmberk t w w t w Fig. 3. Table. 1. Medium CT number Linear attenuation coefficient, cm -1 Bone Water Striated muscle Fat Air Fig

coefficient, cm -1 Bone 808 0.38 Water 0 0.

4 Fig. 6. A B Fig. 5. C

5 o i m o i m Fig. 7. Fig. 8. A B C D Fig. 9. A, C. B, D

6 Michael Rhodes. Computer Graphics in Medicine. IEEE Computer Graphics & Applications pp March Mason Woo, Jackie Neider, Tom Davis. OpenGL Programming Guide. Second Edition. Addison Wesley Edward Angel. Interactive Computer Graphics, A top-down approach with OpenGL. Addison Wesley Lorensen, W. E. and Cline, H. E.. Marching Cubes: A High Resolution 3D Surface Construction Algorithm. Computer Graphics Proc. SIGGRAPH July Ramin Shahidi. Rhea Tombropoulos, and Robert P. Grzeszczuk. Clinical Applications of Three-Dimensional Rendering of Medical Data Sets. Proceedings of The IEEE. vol. 86. No. 3. March Delaunay triangulation Arie E. Kaufman & Lisa M. Sobierajski. Continuum Volume Display. pp CRC Press 9. Philippe G.Lacroute. Fast Volume Rendering Using A Shear- Warp Factorization of The Viewing Transformation. Technical Report:CSL-TR , Computer Systems Laboratory. Departments of Electrical Engineering and Computer Science. Stanford University. September Derek R. Ney, Elliot K. Fishman, and Donna Magid, and Robert A. Drebin. Voumetic Rendering of Computed Tomography Data: Principles and Techniques. IEEE Computer Graphics & Applications. pp March Barthold Lichtenbelt, Randy Crane, and Shaz Naqvi. Introduction To Volume rendering. Prentice Hall Marc Levoy. Display of Surfaces from Volume Data. IEEE Computer Graphics & Applications. pp May Philippe Lacroute, Marc Levoy. Fast Volume Rendering Using a Shear- Warp Factorization of the Viewing Transformation. Computer Graphics Proc. SIGGRAPH. pp K. Kirk Shung, Michael B. Smith, and Benjamin M. W. Tsui. Principles of Medical Imaging. Academic Press. pp Otto H. Wegener. Whole Body Computed Tomography. second edition. Black Well Scientific Publications

Computer Graphics Proc. SIGGRAPH. 21. 4. July 1987 6. Ramin Shahidi. Rhea Tombropoulos, and Robert P. Grzeszczuk. Clinical Applications of Three-Dimensional Rendering of Medical Data Sets.

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63-69±è´ë¿µ Study on the Shadow Effect of 3D Visualization for Medical Images ased on the Texture Mapping D.Y. Kim, D.S. Kim, D.K. Shin, D.Y. Kim 1 Dept. of iomedical Engineering, Yonsei University = bstract = The