[1] [1] Johnson T R. Dual-energy CT: General principles[J]. American Journal of Roentgenology, 2012, 199(5): S3-S8.

[2] [2] Zhao Yunsong, Zhang Huitao, Zhao Xing, et al. Iterative reconstruction model and reconstruction method for dual energy computed tomography[J]. Acta Electronica Sinica, 2014, 42(4): 666-671.

[3] [3] Li Baolei, Zhang Yaojun. Projection decomposition algorithm of X-ray dual-energy computed tomography based on projection matching[J]. Acta Optica Sinica, 2011, 31(3): 0311002.

[4] [4] Fessler J A, Elbakri I A, Sukovic P, et al. Maximum-likelihood dual-energy tomographic image reconstruction[C]. SPIE, 2002, 4684: 38-49.

[5] [5] Sukovic P, Clinthorne N H. Penalized weighted least-squares image reconstruction for dual energy X-ray transmission tomography[J]. IEEE Transactions on Medical Imaging, 2000, 19(11): 1075-1081.

[6] [6] Dong X, Niu T Y, Zhu L. Combined iterative reconstruction and image-domain decomposition for dual energy CT using total-variation regularization[J]. Medical Physics, 2014, 41(5): 051909.

[7] [7] Niu T Y, Dong X, Petrongolo M, et al. Iterative image-domain decomposition for dual-energy CT[J]. Medical Physics, 2014, 41(4): 041901.

[8] [8] Alvarez R E, Macovski A. Energy selective reconstruction in X-ray computed tomography[J]. Physics in Medicine and Biology, 1976, 21(5): 733-744.

[9] [9] Kalender W A, Perman W H, Vetter J R, et al. Evaluation of a prototype dual-energy computed tomographic apparatus. I. Phantom studies[J]. Medical Physics, 1986, 13(3): 334-339.

[10] [10] Ying Z, Naidu R, Crawford C R. Dual energy computed tomography for explosive detection[J]. Journal of X-Ray Science and Technology, 2006, 14(4): 235-256.

[11] [11] Tang Z W, Hu G S. Dual energy CT imaging in cone-beam micro-CT for improved attenuation coefficient measurement[J]. Tsinghua Science and Technology, 2011, 16(4): 352-357.

[12] [12] Liu Y Y, Cheng J P, Zhang L, et al. A low-cost dual energy CT system with sparse data[J]. Tsinghua Science and Technology, 2014, 19(2): 184-194.

[13] [13] Sidky E Y, Yu L F, Pan X C, et al. A robust method of X-ray source spectrum estimation from transmission measurements: Demonstrated on computer simulated, scatter-free transmission data[J]. Journal of Applied Physics, 2005, 97: 124701.

[14] [14] Zhang Huitao, Zhang Peng. X-ray spectrum estimation method from scanning data of computed tomography phantoms[J]. Acta Optica Sinica, 2013, 33(11): 1134001.