The marching cube algorithm is currently one of the most popular three-dimensional(3D)reconstruction surface rendering algorithms.It forms cube voxels based on an input image and then uses 15 basic topological configu...The marching cube algorithm is currently one of the most popular three-dimensional(3D)reconstruction surface rendering algorithms.It forms cube voxels based on an input image and then uses 15 basic topological configurations to extract isosurfaces from the voxels.The algorithm processes each cube voxel in a traversal-based manner,but it does not consider the relationship between the isosurfaces in adjacent cubes.Owing to ambiguity,the final reconstructed model may have holes.In this paper,we propose a marching cube algorithm based on edge growth.The algorithm first extracts seed triangles,grows these seed triangles,and then reconstructs the entire 3D model.According to the position of the growth edge,we propose 17 topological configurations with isosurfaces.The reconstruction results showed that the algorithm can reconstruct the 3D model well.When only the main contour of the 3D model is required,the algorithm performs well.In addition,when there are multiple scattered parts in the data,the algorithm can extract only the 3D contours of the parts connected to the seed by setting the region selected based on the seed.展开更多
A 3D femoral model was built to obtain the three-dimensional temperature distribution of femur and its surrounding tissues and provide references for clinical applications. According to the relationship between gray-v...A 3D femoral model was built to obtain the three-dimensional temperature distribution of femur and its surrounding tissues and provide references for clinical applications. According to the relationship between gray-value and material properties,the model was assigned with various materials to make sure that it is more similar to the real femur in geometry and physical properties. 3D temperature distribution is obtained by using finite element analysis software ANSYS 11. 0 on the basis of heat conduction theory,Laplace equation,Pennes bio-heat transfer equation,thermo physical parameters of bone tissues,the boundary condition,and initial conditions. Taken the asymmetry of the 3D distribution of temperature into account,it is necessary to adopt the heating method with multiple heat sources. This method can ensure that the temperature fields match well with the tumor tissues and kill the tumor cells efficiently under the condition of protecting the normal tissues from damage. The analysis results supply important guidance for determining the needle position and the needle number and controlling the intensity of heating.展开更多
基金the NSFC(61972117)the Natural Science Foundation of Heilongjiang Province of China(ZD2019E007)。
文摘The marching cube algorithm is currently one of the most popular three-dimensional(3D)reconstruction surface rendering algorithms.It forms cube voxels based on an input image and then uses 15 basic topological configurations to extract isosurfaces from the voxels.The algorithm processes each cube voxel in a traversal-based manner,but it does not consider the relationship between the isosurfaces in adjacent cubes.Owing to ambiguity,the final reconstructed model may have holes.In this paper,we propose a marching cube algorithm based on edge growth.The algorithm first extracts seed triangles,grows these seed triangles,and then reconstructs the entire 3D model.According to the position of the growth edge,we propose 17 topological configurations with isosurfaces.The reconstruction results showed that the algorithm can reconstruct the 3D model well.When only the main contour of the 3D model is required,the algorithm performs well.In addition,when there are multiple scattered parts in the data,the algorithm can extract only the 3D contours of the parts connected to the seed by setting the region selected based on the seed.
基金Sponsored by the National Natural Science Foundation of China(Grant No.61272387)the Program for New Century Excellent Talents in University(Grant No.NCET-13-0756)the Distinguished Young Scientists Funds of Heilongjiang Province(Grant No.JC201302)
文摘A 3D femoral model was built to obtain the three-dimensional temperature distribution of femur and its surrounding tissues and provide references for clinical applications. According to the relationship between gray-value and material properties,the model was assigned with various materials to make sure that it is more similar to the real femur in geometry and physical properties. 3D temperature distribution is obtained by using finite element analysis software ANSYS 11. 0 on the basis of heat conduction theory,Laplace equation,Pennes bio-heat transfer equation,thermo physical parameters of bone tissues,the boundary condition,and initial conditions. Taken the asymmetry of the 3D distribution of temperature into account,it is necessary to adopt the heating method with multiple heat sources. This method can ensure that the temperature fields match well with the tumor tissues and kill the tumor cells efficiently under the condition of protecting the normal tissues from damage. The analysis results supply important guidance for determining the needle position and the needle number and controlling the intensity of heating.
