Medical image 3D reconstruct is an important application filed for volume rendering, for it special using, it required fast
interactive speed and high image quality. The ray casting algorithm (RCA) is a widely used basic volume rendering
algorithm. It can get high quality image but the rendering speed is very slowly for powerful computing capacity. Due to
these shortcomings and deficiencies, the accelerated ray casting algorithm is presented in this paper to improve its
rendering speed and apply it to medical image 3D reconstruct. Firstly, accelerate algorithms for ray casting are fully
studied and compared. Secondly, improved tri-linear interpolation technology has been selected and extended to
continuous ray casting in order to reduce matrix computation by matrix transformation characteristics of re-sampling
points. Then ray interval casting technology is used to reduce the number of rays. Utilizing volume data sets cropping
technology that improving boundary box technique avoids the sampling in empty voxel. Finally, the synthesized
accelerate algorithm has been proposed. The result shown that compare with standard ray casting algorithm, the
accelerate algorithm not only improve the rendering speed but also produce the required quality images.
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