Application research of three-dimensional reconstruction in the digitalized virtual liver based on hepatic vessel skelecton line

Objective To study the methodology of three-dimensional reconstruction of the digitalized virtual liver.Methods The liver was perfused with filling materials in different colors through hepatic ducts and scanned by hispeed CT to obtain the image dataset.CT images were preprocessed in binary way.The Marching Cube(MC)algorithm,a kind of surface rendering,were employed to reconstruct 3D surface models of liver and intrahepatic ducts,and then these 3D surface models were smoothed and simplified.The abstract vessel trees were constructed,after the skeleton line of the vessel system were extracted from the hepatic CT dataset.The extracted vessel tree was combined with the vessel surface model for analyzing the vessel structure interactively.Results In the reconstituted liver model,the images of liver parenchyma,hepatic veins and portal veins were vividly displayed respectively or in combination.This visible system of liver provided a graphics user interface to rotate and scale the 3D liver to observe 3D morphological features of the liver and intrahepatie duct by setting the pellucidit value and colors.Conclusion 3D liver model with intrahepatic vessel.which was 3-dimensionally reconstructed in the method of skeleton line using CT scanning images,has good interaction,powerful immersion and great imagination. Key words: Liver; Image processing,computer-assisted; Three dimensional reconstruction; Virtual liver; Portal system; Portography