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| 龚绍润,高峰,刘泓.X射线同轴相衬成像原理数值模拟及实验初探.软件学报,2009,20(5):1156-1165 |
| X射线同轴相衬成像原理数值模拟及实验初探 |
| Numerical Simulations and Preliminary Experiments of the Principle of X-Ray In-Line Phase-Contrast Imaging |
| 投稿时间：2008-05-29 修订日期：2009-03-17 |
| DOI： |
| 中文关键词: 数值模拟 物体传输函数 微焦点源 同轴相衬成像 |
| 英文关键词:numerical simulation object transport function focal spot in-line phase-contrast imaging |
| 基金项目:Supported by the National Natural Science Foundation of China under Grant Nos.60578008, 60678049 (国家自然科学基金); the National Basic Research Program of China under Grant No.2006CB705700 (国家重点基础研究发展计划(973)); the Tianjin Municipal Natural Science Foundation of China under Grant No.07JCYBJC06600 (天津市自然科学基金); the Program of Introducing Talents of Discipline to Universities of China under Grant No.B07014 (高等学校学科创新引智计划) |
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| 摘要点击次数: 5471 |
| 全文下载次数: 4638 |
| 中文摘要: |
| 主要对微焦点源X射线同轴相衬成像系统的系统参数进行了设计与讨论,并对结果进行了实验验证.根据实际选取X射线能量以及物体的折射率改变量和吸收因子来确定物体传输函数,从物体到探测面的距离、物体边缘渐变宽度等因素对图像可见度的影响进行分析,提出了改进分辨率方法并通过数值模拟得到验证.最后,在实验中对普通三角板进行相衬成像,并与其吸收衬度成像进行对比.实验结果表明,利用数值模拟的方法可以指导微焦点源相衬成像参数设计,同时验证了该实验仪器的相衬能力. |
| 英文摘要: |
| This paper introduces the design, analysis and experimental verification of focal spot X-ray in-line imaging system. First of all, the object transmission function is fixed by the refractive index decrement and the absorption index of tissue according to the previously selected energy. After the factors being analyzed, such as the distance between the object and detector, and the object edge width, which can affect imaging quality, methods presented to improve image resolution are validated. In the experiment, plastic set square is irradiated with X-ray phase-contrast technique. The result is then compared with that using traditional X-ray imaging technique. The experimental results exhibit considerable consistency with former numerical simulation, which proves that the particular method can be used to determine the parameters of imaging system. |
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