| X射线成像的相位衬度与吸收衬度分析 |
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| 引用本文： | 李然,冯盛,刘松,张学龙.X射线成像的相位衬度与吸收衬度分析[J].福建农林大学学报(哲学社会科学版),2009(3). |
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| 作者姓名： | 李然 冯盛 刘松 张学龙 |
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| 作者单位： | 上海理工大学医疗器械学院;上海医疗器械高等专科学校; |
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| 基金项目： | 上海市重点学科(P0502);;上海市高校科技发展基金(07ZZ93);;上海市重大科研项目基金(06DZ11311);;河南省自然科学基金(0611051500)资助项目 |
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| 摘 要： | 临床X射线成像所使用的X射线源实际上都是部分相干的,由部分相干源在一定距离内所成的像一般既有吸收衬度又有相位衬度。本文根据Fresnel-Kirchhoff衍射理论的基本思想,导出X射线相位衬度成像的理论公式,着重对其衬度进行分析,并与实验作了比照,结果与预期的相符。
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| 关 键 词： | 相位成像 振幅近似 相位缓变 相位衬度 吸收衬度 |
On the Contrast of Attenuation and Phase of X-ray Imaging |
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| Ran Li,Sheng Feng,Liu Song,Zhang Xuelong.On the Contrast of Attenuation and Phase of X-ray Imaging[J].Journal of Fujian Agriculture and Forestry University,2009(3). |
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| Authors: | Ran Li Sheng Feng Liu Song Zhang Xuelong |
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| Institution: | 1Science College;University of Shanghai Science and Technology;Shanghai 200093;2Shanghai Medical Instrumentation College;USST;Shang hai 200093 |
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| Abstract: | In generally partial coherent X-ray sources are employed in the clinical imaging.The image has both phase contrast and attenuation contrast,which was gained in a certain distance from a partial coherent source.A theoretical intensity formula for X-ray phase-contrast imaging was deduced based on Fresnel-Kirchhoff diffraction theory and both amplitude approximation and moderate variation condition for phases,which are applicable to the clinical application.The phase-contrast and attenuation contrast were anal... |
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| Keywords: | Phase-contrast Imaging Amplitude approximation Phases moderate variation Phase contrast Attenuation contrast |
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