[1]刘 鑫,郭金川,牛憨笨.基于微焦斑源X射线传播的相衬成像模拟[J].深圳大学学报理工版,2007,24(3):261-266.
 LIU? Xin,GUO Jin-chuan,and NIU Han-ben.The simulation of X-ray phase-contrast imaging with partially coherence source[J].Journal of Shenzhen University Science and Engineering,2007,24(3):261-266.
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基于微焦斑源X射线传播的相衬成像模拟()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第24卷
期数:
2007年3期
页码:
261-266
栏目:
出版日期:
2007-07-30

文章信息/Info

Title:
The simulation of X-ray phase-contrast imaging with partially coherence source
文章编号:
1000-2618(2007)03-0261-06
作者:
刘 鑫12郭金川2牛憨笨2
1)华中科技大学光电子科学与工程学院,武汉 430074;
2)深圳大学光电子研究所,光电子器件与系统教育部重点实验室(深圳大学),深圳 518060
Author(s):
LIU? Xin12GUO Jin-chuan2and NIU Han-ben2

1)Institute of Optoelectronics Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,P.R.China
2)Institute of Optoelectronics,Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education,Shenzhen University,Shenzhen 518060,
P.R.China

关键词:
X射线衍射快速傅立叶变换空间频域相衬成像微焦斑X射线管
Keywords:

X-ray diffraction fast Fourier transform spatial frequency domain X-ray phase contrast imaging microfocus X-ray tube

分类号:
基于微焦斑源X射线传播的相衬成像模拟
文献标志码:
A
摘要:

从标量衍射及部分相干光衍射理论出发,结合硬X射线特点,建立基于微焦斑X射线源的衍射成像模型.该模型将Fresnel积分运算转换到空间频域,利用快速傅里叶变换计算衍射光场.根据部分相干光理论分析,有限大小光源的物体衍射光场为光源光强分布与点源所形成的物体衍射光场的卷积,将卷积运算转换到空间频域并利用快速傅里叶变换算法提高运算速度.模拟衍射结果表明,物体到X射线源的距离、X射线光子能量以及X射线源焦斑尺寸均影响自由空间传播相衬成像系统的图像衬度.研究结果有助于X射线相衬成像系统的设计和性能优化.

Abstract:

An X-ray diffraction imaging model based on microfocus X-ray tube was presented . The model used the scalar diffraction and partial coherent X-ray diffraction theories, taking the hard X-ray features in consideration. In this model, the Fresnel integral was performed in the spatial frequency domain, and the X-ray diffraction field was calculated by means of the fast Fourier transform (FFT). According to the partial coherent theory, the X-ray intensity in the image plane was the convolution of the intensity of object irradiated by the X-ray beam from an ideal point source with the intensity distribution of the expanded source. Thus the intensity distribution in the image plane can be obtained by transforming the convolution in the real space to the multiplication in the spatial frequency domain, and its calculation efficiency can be improved by using the FFT. The simulation results show that the image contrast is determined by the distance from the source to object plane, by the energy of X-ray photon, and by the size of X-ray focal spot. The simulation is helpful for the design of X-ray phase contrast imaging system based on the free space propagation.

参考文献/References:

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更新日期/Last Update: 2007-12-06