In order to realize real-time rendering for medical images on PCs,a scheme combining multi factors for assigning optical attribute to resampling points is defined,and then a novel rendering algorithm for medical volumetric data is presented.The volumetric data are classified into the foreground voxels and background voxels,and the foreground voxels are resampled using Layer of Detail(LOD) technique.Then,the optical attributes of resampling points are determined by the defined method,which is reasonably associated with the distances between object and viewpoint,as well as object and light source.Finally,the background voxels are displayed by the accelerated method based on space leaping resampling.The experimental results indicate the presented algorithm can reach up to 2.5 frame/s clearly on PCs for 512×512×482×2 Byte volumetric data,when it reduced to 2/3 times of the original size.It comes to the conclusion that the interactive volume rendering can be implemented for most medical volume data on PCs.Moreover,tissues or organs can be displayed clearly,which is more coincident with the human vision.