关键词: 三维可视化, 体绘制, 光线投射, 图形处理器, 心脏

Abstract: Imaging and visualization of heart play an important role in cardiac disease diagnosis and therapy planning. To visualize the segmented cardiac volume datasets, an approach based on Graphics Processing Unit (GPU) acceleration raycasting algorithm was proposed to reconstruct high-quality image. Firstly, the transfer function was designed by using statistical information of the cardiac volume datasets, which was used for increasing opacity of the subtle tissues. Secondly, the sampling step was adaptively adjusted based on the gradient, which was utilized to increase sampling frequency of the borderline tissues. Finally, the improved Blinn-Phong illumination model with multiple lamp-houses was also employed for enhancing the visualization effect. The experimental results show that the proposed method can meet the requirements of real-time rendering and obtain high-quality volume rendering results. Cardiac subtle tissues are rendered clearly such as valves and coronary artery veins.

Key words: three-dimensional visualization, volume rendering, raycasting, Graphics Processing Unit (GPU), heart