Using GPU to calculate electron dose for hybrid pencil beam model

Hybrid pencil beam model(HPBM) offers an efficient approach to calculate the three-dimension dose distribution from a clinical electron beam.Still,clinical radiation treatment activity desires faster treatment plan process.Our work presented the fast implementation of HPBM-based electron dose calculation using graphics processing unit(GPU).The HPBM algorithm was implemented in compute unified device architecture running on the GPU,and C running on the CPU,respectively.Several tests with various sizes of the field,beamlet and voxel were used to evaluate our implementation.On an NVIDIA GeForce GTX470 GPU card,we achieved speedup factors of 2.18- 98.23 with acceptable accuracy,compared with the results from a Pentium E5500 2.80 GHz Dual-core CPU.