Interactive 3D Visualization of Large CT Datasets

In this paper, we present an efficient, high-quality volume rendering algorithm using GPUs for rendering large CT datasets at interactive frame rates on standard PC hardware. We subdivide the volume dataset into uniform sized blocks and take advantage of combinations of early ray termination, empty-space skipping and visibility culling to accelerate the whole rendering process and render visible parts of volume data. We have implemented our volume rendering algorithm for a large volume data of 512×304×1878 dimensions (visible female), and achieved real-time performance (i.e., 3-4 frames per second) on a Pentium 4 2.4 GHz PC equipped with NVIDIA Geforce graphics card (512 MB video memory). This method can be used as a 3D visualization tool of large CT datasets for doctors or radiologists.