Study On 3D Reconstruction And Interaction Of Medical Images Based On VTK

Medical image 3D reconstruction and interaction is a hot topic,which is widely used in important applications like computer graphics and image processing of biomedicine engineering.3D reconstruction and interaction of medical images is widely used in diagnosing,surgery planning and simulating, plastic and artificial limb surgery,radiotherapy planning,and teaching etc.In this paper,3D reconstruction and interaction of medical images is studied,and significance and worthiness is obvious in application.Firstly,the realization and principle of Marching Cubes and Ray Casting for 3D medical image reconstruction with surface rendering and volume rendering are discussed and contrasted in this paper.The excellence and shortage of the two rendering methods are discussed.And the realization mechanism of visualization tool package based on VTK is analyzed.In the paper,Marching Cubes and Ray Casting algorithm are 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 are 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 screen.Therefore,extraction of cross-section images on 3D medicine image can be realized in any direction.The cuboids that are structured can be zoomed,moved and circumrotated by operating mouse to incise 3D reconstruction object.Real time interaction can be realized by clipping the reconstruction object.The coordinates can be acquired by the mouse clicking in the 3D space,by which to realize the point mouse pick-up as well measure the 3D medicine image. Finally,realization of 3D medical images interaction are done in fields such as mouse pick-up,angle and distance measure in space,plane clipping,cuboids interaction clipping,extraction of cross-section images in any direction etc.