Ray Casting algorithm is usually used in medical volume visualization

but there are a lot of limitations inherent to this algorithm

like high computational demand

low quality images

or a fixed classification. In these respects

a schedule for assigning optical attribute to resampling points is defined

and the schedule is reasonably associated with distance between the object and the viewpoint

as well as the object and the light source. Based on this

an efficient and accurate rendering algorithm for medical images is presented in this paper

and the algorithm classifies volumetric data into the foreground voxels and background voxels

and the former voxels are resampled using LOD (Layer of Detail) technique

then optical attribute of the resampling points is determined by the above-mentioned method. At the same time

the background voxels are displayed by the accelerated method based on space leaping resampling. The results show that the presented algorithm can achieve up to 2.5 fps on PCs for 512×512×482×2 Byte volumetric data. Meanwhile

tissues or organs can be displayed clearly

which is more coincident with the human vision.