Firstly，the realization and principle of Marching Cubes and Ray Casting for 3D medical image reconstruction with surface rendering and volume rendering ale discussed and contrasted in this paper．The excellence and shortage of the two rendering methods ale discussed．And the realization mechanism of visualization tool package based on VTK is analyzed．In the paper,Marching Cubes and Ray Casting algorithm ale respectively adopted to reconstruct the 3D images for the CT image sequence of the DICOM format under the VC++6.0 and the visual package VTK platform．The key algorithms and 3D visualization results are given in this paper．The simple interactive operations，such as rotation，zoom and transfer Can be realized by user interaction with PC．Secondly，the vector and inner points ale calculated to form the virtual clipping plane，which in turn is used to incise the 3D object。And the information of cross—section images is obtained，at the same time the correspondent images are displayed on the scr

VTK based on VC++.pdf

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