[1] [1] Davide W, Simon R. Combining an atomy and function the path to true image fusion[J]. Eur Radiol, 2001, 11(10): 1968-1974.

[2] [2] Wang Jingyun, Li Shaolin. The new progress of medical imaging technology[J]. J Fourth Military Medical University, 2004, 25(20): 1918-1920.

[3] [3] Chen Wufan, Qin An, Jiang Shaofeng, et al.. Medical image analysis: state of the art and future directions[J]. Chinese J Biomedical Engineering, 2008, 27(2): 175-181.

[4] [4] Xin Yanan, Deng Lei. An improved remote sensing image fusion method based on wavelet transform[J]. Laser & Optoelectronics Progress, 2013, 50(2): 021001.

[5] [5] Do M N, Vetterli M. The contourlet transform: an efficient directional multiresolution image representation[J]. IEEE Trans Image Processing, 2005, 14(12): 2091-2106.

[6] [6] Zheng Jing, Zheng Yongguo. An image fusion method based on contourlet transform[J]. InformationTechnology & Informatization, 2011, 10(2): 37-40.

[7] [7] Da Cunha A L, Zhou J, Do M N. The nonsubsampled contourlet transform: theory, design and application[J]. IEEE Trans Image Processing, 2006, 15(10): 1779-1793.

[8] [8] Sun Yanzhong, Li Huafeng, Li Baoshun. Image fusion algorithm using multiscale products of nonsampled contourlet transform[J]. Computer Simulation, 2011, 28(8): 225-255.

[9] [9] Wang Dan, Zhou Jincheng. Image fusion based on the nonsubsampled contourlet transform[J]. Computer Systems & Applications, 2010, 19(12): 185-189.

[10] [10] Chang Xia, Jiao Licheng, Jia Jianhua. Multisensor image adaptive fusion based on nonsampled contourlet[J]. Chinese J Computers, 2009, 32(11): 2229-2238.

[11] [11] Liu Yinghui, Jiang Wei, Wei Ge. PET/CT image fusion based on nonsampled contourlet transform[J]. Optical Technique, 2010, 36(1): 121-125.