基于分析晶体成像投影偏移研究
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摘要
投影偏移将严重影响基于分析晶体成像系统的信息提取精度和图像质量。从基于分析晶体成像系统的原理出发,建立了光路模型,分析了产生投影偏移的主要原因,计算机模拟研究了投影偏移对折射角信息提取的影响。结果表明,投影偏移主要由分析晶体本征摇摆曲线宽度和折射角所产生。本征摇摆曲线宽度将导致相邻像素之间的射线随分析晶体的摇摆相互偏移,当样品未被射线完全覆盖时,边界像素的摇摆曲线将出现形变,虚像素将出现计数并形成畸形摇摆曲线。折射角引起的投影偏移将使摇摆曲线形状和高度发生改变,随折射角增大,出现像素错位,其影响折射角信息提取的正确性。本征摇摆曲线宽度和折射角共同产生投影偏移并影响折射角信息的提取。
The projection offset significantly affects the extraction accuracy and image quality in analyzer-based imaging(ABI) system. Based on the principle of the ABI system, optical models were established to study the main causes of projection offset. The effect of projection offset on the extraction of refraction-angle was studied by computer simulation. The results show that the projection offset is mainly caused by the width of the intrinsic rocking curve and the refraction-angle. The width of the intrinsic rocking curve causes the crosstalk of X-ray between adjacent pixels with the rocking of the analyzer. The rocking curve of the boundary pixel deforms, and for the virtual pixel counts appear and abnormal rocking curve forms when samples are not completely covered with the beam. Both shape and height of the rocking curve change by the projection offset caused by refraction-angle, and pixel shifting occurs with the increase of refraction-angle, further affecting the correct of the extraction of refraction-angle. The width of the intrinsic rocking curve and the refraction-angle together produce projection offset and affect the extraction of refraction-angle.
The projection offset significantly affects the extraction accuracy and image quality in analyzer-based imaging(ABI) system. Based on the principle of the ABI system, optical models were established to study the main causes of projection offset. The effect of projection offset on the extraction of refraction-angle was studied by computer simulation. The results show that the projection offset is mainly caused by the width of the intrinsic rocking curve and the refraction-angle. The width of the intrinsic rocking curve causes the crosstalk of X-ray between adjacent pixels with the rocking of the analyzer. The rocking curve of the boundary pixel deforms, and for the virtual pixel counts appear and abnormal rocking curve forms when samples are not completely covered with the beam. Both shape and height of the rocking curve change by the projection offset caused by refraction-angle, and pixel shifting occurs with the increase of refraction-angle, further affecting the correct of the extraction of refraction-angle. The width of the intrinsic rocking curve and the refraction-angle together produce projection offset and affect the extraction of refraction-angle.
引文
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[25] HU C H, ZHANG L, LI H, et al. Comparison of refraction information extraction methods in diffraction enhanced imaging[J]. Optics Express, 2008, 16(21): 16 704-16 710.
[26] RIGON L, ARFELLI F, MENK R H. Three-image diffraction enhanced imaging algorithm to extract absorption, refraction, and ultrasmall-angle scattering[J]. Applied Physics Letters, 2007, 90(11): 114102.
[27] RIGON L, ARFELLI F, MENK R H. Generalized diffraction enhanced imaging to retrieve absorption, refraction and scattering effects[J]. Journal of Physics D: Applied Physics, 2007, 40(10): 3 077-3 089.
[28] CHEN Z Q, DING F, HUANG Z F, et al. Polynomial curve fitting method for refraction-angle extraction in diffraction enhanced imaging[J]. Chinese Physics C, 2009, 33(11): 969-974.
[29] PAGOT E, CLOETENS P, FIEDLER S, et al. A method to extract quantitative information in analyzer-based X-ray phase contrast imaging[J]. Applied Physics Letters, 2003, 82(20): 3 421-3 423.
[30] HUANG Z F, KANG K J, LI Z. Projection correction for the pixel-by-pixel basis in diffraction enhanced imaging[J]. Journal of Physics D, 2006, 39(14): 2 925-2 931.
[31] ZHOU W, MAJIDI K, BRANKOV J G. Analyzer-based phase-contrast imaging system using a micro focus X-ray source[J]. Review of Scientific Instruments, 2014, 85(8): 085114.
[32] PARHAM C, ZHONG Z, CONNOR D M, et al. Design and implementation of a compact low-dose diffraction enhanced medical imaging system[J]. Academic Radiology, 2009, 16(8): 911-917.
[2] FITZGERALD R. Phase-sensitive X-ray imaging[J]. Physics Today, 2000, 53(7): 23-26.
[3] PISANO E D, GATSONIS C, HENDRICK E, et al. Diagnostic performance of digital versus film mammography for breast-cancer screening[J]. New England Journal of Medicine, 2005, 353(17): 1 773-1 783.
[4] ZHAO Y Z, BRUN E, COAN P, et al. High-resolution, low-dose phase contrast X-ray tomography for 3D diagnosis of human breast cancers[J]. Proceedings of the National Academy of Sciences of the United States of America, 2012, 109(45):18 290-18 294.
[5] KASTNER J, PLANK B, REQUENA G. Non-destructive characterization of polymers and Al-alloys by polychromatic cone-beam phase contrast tomography[J]. Materials Characterization, 2012, 64: 79-87.
[6] EGGL E, SCHLEEDE S, BECH M, et al. X-ray phase-contrast tomography with a compact laser-driven synchrotron source[J]. Proceedings of the National Academy of Sciences of the United States of America, 2015, 112(18): 5 567-5 572.
[7] DIEMOZ P C, BRAVIN A, GLASER C, et al. Comparison of analyzer-based imaging computed tomography extraction algorithms and application to bone-cartilage imaging[J]. Physics in Medicine and Biology, 2010, 55(24): 7 663-7 679.
[8] BRAVIN A, KEYRILAINEN J, FERNANDEZ M, et al. High-resolution CT by diffraction-enhanced X-ray imaging: Mapping of breast tissue samples and comparison with their histo-pathology[J]. Physics in Medicine and Biology, 2007, 52(8): 2 197-2 211.
[9] VINE D J, PAGANIN D M, PAVLOV K M, et al. Analyzer-based phase contrast imaging and phase retrieval using a rotating anode X-ray source[J]. Applied Physics Letters, 2007, 91(25): 254110.
[10] SUORTTI P, KEYRIL?INEN J, THOMLINSON W. Analyser-based X-ray imaging for biomedical research[J]. Journal of Physics D: Applied Physics, 2013, 46(49): 494002.
[11] NESCH I, FOGARTY D P, TZVETKOV T, et al. The design and application of an in-laboratory diffraction-enhanced X-ray imaging instrument[J]. Review of Scientific Instruments, 2009, 80(9): 093702.
[12] ROCHA H S, PEREIRA G R, FARIA P, et al. Diffraction-enhanced imaging microradiography applied in breast samples[J]. European Journal of Radiology, 2008, 68(Suppl.): S37-S40.
[13] ZHANG C, PAN X D, DING J J, et al. Simulation study on characteristics of information extraction in multiple-image radiography[J]. Nuclear Science and Techniques, 2018, 29(5): 72-82.
[14] ARFELLI F, ASTOLFO A, RIGON L, et al. A Gaussian extension for diffraction enhanced imaging[J]. Scientific Reports, 2018, 8(1): 362-375.
[15] CHAPMAN D, THOMLINSON W, JOHNSTON R, et al. Diffraction enhanced X-ray imaging[J]. Physics in Medicine and Biology, 1997, 42(11): 2 015-2 025.
[16] WERNICK M N, WIRJADI O, CHAPMAN D, et al. Multiple-image radiography[J]. Physics in Medicine and Biology, 2003, 48(23): 3 875-3 895.
[17] DILMANIAN F A, ZHONG Z, REN B, et al. Computed tomography of X-ray index of refraction using the diffraction enhanced imaging method[J]. Physics in Medicine and Biology, 2000, 45(4): 933-946.
[18] 孙怡,朱佩平,于健,等. X射线衍射增强成像中吸收、折射以及散射衬度的计算层析[J]. 光学学报,2007,27(4):749-754. SUN Yi, ZHU Peiping, YU Jian, et al. Absorption, refraction and extinction contrast computerized tomography of X-ray diffraction enhanced imaging method[J]. Acta Optica Sinica, 2007, 27(4): 749-754(in Chinese).
[19] ZHU P P, WANG J Y, YUAN Q X, et al. Computed tomography algorithm based on diffraction-enhanced imaging setup[J]. Applied Physics Letters, 2005, 87(26): 264101.
[20] YANG H, XUAN R J, HU C H, et al. Improvement and error analysis of quantitative information extraction in diffraction-enhanced imaging[J]. Chinese Physics B, 2014, 23(4): 048701.
[21] WANG Y B, LI G P, PAN X D, et al. An improved multiple-image radiography method extracting refraction information in analyzer-based imaging[J]. Nuclear Instruments and Methods in Physics Research A, 2015, 770: 182-188.
[22] NESTERETS Y I, COAN P, GUREYEV T E, et al. On qualitative and quantitative analysis in analyser-based imaging[J]. Acta Crystallographica Section A, 2006, 62(4): 296-308.
[23] DIEMOZ P C, COAN P, GLASER C, et al. Absorption, refraction and scattering in analyzer-based imaging: Comparison of different algorithms[J]. Optics Express, 2010, 18(4): 3 494-3 509.
[24] 王云波,李公平,潘小东,等. 多种图像采集策略下X射线折射信息的提取研究[J]. 物理学报,2014,63(10):150-161. WANG Yunbo, LI Gongping, PAN Xiaodong, et al. Simulation of X-ray refraction information extraction using multiple image-collecting strategies[J]. Acta Physics Sinica, 2014, 63(10): 150-161(in Chinese).
[25] HU C H, ZHANG L, LI H, et al. Comparison of refraction information extraction methods in diffraction enhanced imaging[J]. Optics Express, 2008, 16(21): 16 704-16 710.
[26] RIGON L, ARFELLI F, MENK R H. Three-image diffraction enhanced imaging algorithm to extract absorption, refraction, and ultrasmall-angle scattering[J]. Applied Physics Letters, 2007, 90(11): 114102.
[27] RIGON L, ARFELLI F, MENK R H. Generalized diffraction enhanced imaging to retrieve absorption, refraction and scattering effects[J]. Journal of Physics D: Applied Physics, 2007, 40(10): 3 077-3 089.
[28] CHEN Z Q, DING F, HUANG Z F, et al. Polynomial curve fitting method for refraction-angle extraction in diffraction enhanced imaging[J]. Chinese Physics C, 2009, 33(11): 969-974.
[29] PAGOT E, CLOETENS P, FIEDLER S, et al. A method to extract quantitative information in analyzer-based X-ray phase contrast imaging[J]. Applied Physics Letters, 2003, 82(20): 3 421-3 423.
[30] HUANG Z F, KANG K J, LI Z. Projection correction for the pixel-by-pixel basis in diffraction enhanced imaging[J]. Journal of Physics D, 2006, 39(14): 2 925-2 931.
[31] ZHOU W, MAJIDI K, BRANKOV J G. Analyzer-based phase-contrast imaging system using a micro focus X-ray source[J]. Review of Scientific Instruments, 2014, 85(8): 085114.
[32] PARHAM C, ZHONG Z, CONNOR D M, et al. Design and implementation of a compact low-dose diffraction enhanced medical imaging system[J]. Academic Radiology, 2009, 16(8): 911-917.