| 利用计算机断层成像方法由观测图像重建等离子体层全球密度分布——地球遮挡问题 |
| |
| 引用本文： | 黄娅,徐荣栏,李亮,金鑫.利用计算机断层成像方法由观测图像重建等离子体层全球密度分布——地球遮挡问题[J].地球物理学报,2009,52(11):2683-2688. |
| |
| 作者姓名： | 黄娅 徐荣栏 李亮 金鑫 |
| |
| 作者单位： | 1.中国科学院空间科学与应用研究中心，北京 100190;2.中国科学院研究生院，北京 100049;3.清华大学工程物理系，北京 100084;4.粒子技术与辐射成像教育部重点实验室，北京 100084 |
| |
| 基金项目： | 中国探月和夸父地球等离子体层EUV 成像的预研项目;国家自然科学基金项目 |
| |
| 摘 要： | 本文是利用计算机断层成像(CT)方法中的滤波反投影法(FBP)和代数迭代法(ART)，根据等离子体层的仿真模型，重建其全球密度分布.在重建过程中，地球遮挡是一个很重要的问题.计算结果表明两种方法都可以使用，但ART比FBP重建的效果好.ART重建图像的相关系数可达0.98，而FBP重建图像的相关系数仅为0.86.FBP重建的偏差是由地球遮挡引起，向阳面靠近地球区域的密度会减小.从定量分析中可以进一步看出地球遮挡所引起的偏差变化.
|
| 关 键 词： | 等离子体密度 CT 地球遮挡 FBP ART 相关系数 |
| 收稿时间： | 2009-3-23 |
| 修稿时间： | 2009-11-6 |
Deduction of the global density of the plasmasphere reconstructed from the observation images using Computed Tomography technique-The Earth's shelter |
| |
| HUANG Ya,XU Rong-Lan,LI Liang,JIN Xin.Deduction of the global density of the plasmasphere reconstructed from the observation images using Computed Tomography technique-The Earth's shelter[J].Chinese Journal of Geophysics,2009,52(11):2683-2688. |
| |
| Authors: | HUANG Ya XU Rong-Lan LI Liang JIN Xin |
| |
| Institution: | 1.Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China;3.Department of Engineering Physics, Tsinghua University, Beijing 100084, China;4.Key Laboratory of Particle & Radiation Imaging, Ministry of Education， 100084, China |
| |
| Abstract: | The deduction of the global density of Earth plasmasphere from the column density of the plasmasphere is studied by using Computed Tomography (CT) technique,which has been achieved by the well-known Filtered Back Projection (FBP).Due to the Earth's shelter,using this method,there will be a gradual deviation from the original Phantom Diagram especially in the dayside area near the Earth,and this deviation can be acknowledged through further quantitative analysis. An improved accuracy of reconstruction is achieved by using the Algebraic Reconstruction Technique (ART). Their reconstruction quality has been analyzed through the correlation coefficient:between the Phantom Diagram and the reconstruction results,the value of ART approach is 0.98 while FBP approach is only 0.86. The result has established that the ART is more efficient than the FBP when the Phantom Diagram includes Earth's shelter. |
| |
| Keywords: | CT FBP ART Density of the plasmasphere CT Earth's shelter FBP ART Correlation coefficient |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
