Abstract: Electron tomography (ET) is widely used in reconstructing non-uniform cells or macromolecules in nano scale. One of the best methods of ET is iterative reconstruction due to its outstanding quality of reconstruction, but it is limited by its huge computational requirements. A parallel simultaneous iterative reconstruction technique(SIRT) was designed and implemented based on UPU platform with Tesla 01060 using CUDA programming languages. Experimen- tal results demonstrate the performance of optimized parallel SIRI} algorithm. I}he maximum speedup of the parall c1 SIRT is 47 times of secauential SIRT approach, and it is not any loss of accuracy.

Key words: Electron tomography, SIRT, Parallel computing, UPU, CUlDA,ATOM