[1] JAKUBEK J, GRANJA C, DAMMER J, et al. Phase contrast enhanced high resolution X-ray imaging and tomography of soft tissue[J]. Nuclear Instruments and Methods in Physics Research A, 2007, 57(1): 69-72.
[2] WEITKAMP T, DIAZ A. X-ray phase imaging with a grating interferometer[J].Optical Society of America, 2005, 12(16): 6296-6304.
[3] XINGCHEN P, PVEETIL S, LIU C, et al. High-contrast imaging for weakly diffracting specimens in coherent diffraction imaging[J].Chinese Optics Letters, 2013, 11(2): (021103-1)-(021103-3).
[4] POGANY A, GAO D. Contrast and resolution in imaging with a microfocus x-ray source[J]. Review of Scientific Instruments, 1997, 68(7): 2774-2782.
[5] DAVIS J A, MCNAMARA D E, COTTRELL D M, et al. Imaging processing with the radial Hilber transformation :theory and experiment[J].Opttics Letters, 2000, 25(2): 99-101.
[6] SHIBIAO W, JING B, SIWEI Z, et al. Image edge-enhancement in optical microscopy with a phase mismatched spiral phase plate[J].Chinese Optics Letter, 2011, 9(3):(031001-1)-(031001-4).
[7] SAKDINAWAT A, LIU Y. Soft-x-ray microscopy using spiral zone plates[J]. Opttics Letters, 2007, 32(18): 2635-2637.
[8] BOKOR N, IKETAKI Y. Laguerre-Gaussian radial Hilber transform for edge-enhancement Fourier transform x-ray microscopy[J]. Opttics Letters, 2009, 17(7): 5533-5539.
[9] YI Tao, CAO Lei-feng, YANG Guo-hong, et al. Edge enhancement imaging using spiral zone plate[J]. High Power Laser and Particle Beams, 2010, 22(9): 2075-2078.
[10] YI Tao, CAO Lei-feng, LIU Shen-ye, et al. Study on the spatial resolution of spiral zone plate imaging[J].Journal of Optoelectronics·Laser, 2010, 21(7): 1089-1092.
[11] CHANGQING X, XIAOLI Z, LINA S, et al. Spiral photon sieves apodized by digital prolate spheroidal window for the generation of hard-x-ray vortex[J]. Opttics Letters, 2010, 35(11): 1765-1767.
[12] CAO Q, JAHNS J. Comprehensive focusing analysis of various Fresnel zone plates[J]. Opttics.Letters, 2004, 21(4): 561-571.
[13] YI Tao, YANG Guo-hong, WEI Min-xi, et al. Study on focusing properties of spiral zone plate[J].Acta Optica Sinica, 2012, 32(7): (0705004-1)-(0705004-5).
[14] CHEN J, YUAN X C, ZHAO X, et al. Generalized approach to modifying optical vortices with suppressed sidelobes using Bessel-like functions[J]. Opttics Letter, 2009, 34(21): 3289-3291.
[15] CHEN J, ZHAO X, FANG Z, et al. Explicit relations and optimal parameters for sidelobe suppression in optical vortices with a modified Bessel function[J]. Opttics Letters, 2010, 27(4): 935-940.
[16] KIPP L, SKIBOWSKI M, JOHNSON R L, et al. Sharper images by focusing soft X-rays with photon sieves[J]. Nature, 2001, 414(6860): 184-188.
[18] SHARMA K M, SINGH K R, JOSEPH J, et al. Fourier spectrum analysis of spiral zone plates[J]. Optics Communications, 2013, 30(4): 43-48.