The fast development of the Graphics Processing Unit’s progammability and parallel computing power provides new solutions for visualization technology. As the carrier of volume date, a cubic box is selected as the bounding box in the improved ray-casting algorithm, whose diagonal vertex coordinates are stored in boxMin and boxMax respectively. By adjusting the two parameters we can change the shape of the bounding box and then choose the interesting region of the object, a CUDA based interactive volumetric clipping tool is finally realised. By changing the shape of bounding box, the axial volumetric clipping and arbitrary cross-section clipping are important ways to help to get the object's internal information. Experiments show this method is simple, efficient and useful especially for the irregular shape defect. In addition, even for the larger volume of data, we can get a high quality, cross-sectional images on a fast speed.

The fast development of the Graphics Processing Unit’s programmability and parallel computing power provides new solutions for visualization technology. Using Image processing techniques according to the ICT image gray state of existence and CUDA based classical ray-casting algorithm of volume rendering，By the contrast of volume rendering’s effect showed in different aspects involved in its entirety，plane cutting and local amplification;We can get high quality image with fast speed and with the preprocessed volume date used in the method Contrast finely with the original volume date, which can be well complementary to display the characteristics of defects.