关键词: 医学图像，大体数据，体绘制，可见性测试，预积分

Abstract: In order to do fast volume rendering for a large medical volume data and meanwhile assure the quality of rendering, a fast volume rendering method was presented. Firstly, the large medical volume data was divided into equal-size blocks, and then a set of visibility tests such as empty block space skipping, early block termination and early ray termination were used to speed up the whole rendering process. Finally,volume rendering prcintegration was utilized to improve the performance of volume rendering. The experiment results show that the proposed fast volume rendering has picked up the speed of rendering for a large medical volume data without loss of image quality.

Key words: Medical image, Large volume data, Volume rendering, Visibility test, Pre-integration