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

孙怡; 朱佩平; 于健; 陈欣

光学学报, 2007, 27 (4): 749, 网络出版: 2007-04-25

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

Absorption, Refraction and Extinction Contrast Computerized Tomography of X-Ray Diffraction Enhanced Imaging Method

论文大纲

孙怡 ^1,*朱佩平 ²于健 ¹陈欣 ¹

作者单位

¹ 大连理工大学电子与信息工程学院, 大连 116023

² 中国科学院高能物理研究所, 北京 100049

X射线光学相敏成像衍射增强成像计算层析 X-ray optics phase-sensitive imaging diffraction enhanced imaging computed tomography

摘要

X射线相位衬度成像是一种新型的X射线成像技术,通过记录射线穿过物体后相位的改变对物体进行成像,可以提供比传统的X射线吸收成像更高的图像衬度以及空间分辨力。衍射增强成像方法(Diffraction enhanced imaging,DEI)是X射线相位衬度成像方法之一,利用一块放置在物体和探测器之间的分析晶体提取物体的吸收、折射以及散射信息并进行成像。将衍射增强成像方法与计算机断层成像技术(Computerized Tomography)进行结合,利用吸收、散射以及折射信息,分别采用滤波反投影以及雷登(Radon)变换,对昆虫样品——蜜蜂进行计算层析重建,获得了好于X射线吸收计算层析的重建结果,验证了衍射增强成像信息分离计算层析的优越性。

Abstract

The X-ray phase-contrast imaging method, which images the object by recording the phase change after X-ray passing through the object, is a new X-ray imaging technique. This new imaging method can provide higher contrast and spatial resolution than the conventional X-ray absorption imaging method. Diffraction enhanced imaging (DEI) method is one of the four phase-contrast X-ray imaging techniques. DEI method can extract the absorption, refraction and extinction information of the object with an analyzer crystal placed between the object and detector. DEI method is combined with the computed tomography (CT), EDI-CT, to construct the insect sample——a bee with its absorption, extinction and refraction information with filtered back algorithm and Radon transform method. The results obtained by DEI-CT are better than the absorption CT, and proves that the DEI-CT is superior to the conventional CT.

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孙怡, 朱佩平, 于健, 陈欣. 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. 孙怡, 朱佩平, 于健, 陈欣. Absorption, Refraction and Extinction Contrast Computerized Tomography of X-Ray Diffraction Enhanced Imaging Method[J]. Acta Optica Sinica, 2007, 27(4): 749.

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