| 一种用于走时层析成像的改进算法 |
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| 引用本文： | 马宁,胡正仪.一种用于走时层析成像的改进算法[J].CT理论与应用研究,1995,4(4):43-49. |
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| 作者姓名： | 马宁 胡正仪 |
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| 作者单位： | 武汉大学电信学院 |
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| 摘 要： | 走时层析成像是根据首波走时重建声波、地震波或电磁波波速的层析技术，其所用到的射线路径依赖于波速分布。本文提出了一个依据费马原理寻找射线路径的新方法。费马原理指出，从发射点到接点的射线首波的走时极小，因此寻找射线路径的问题是一个最优化问题。
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| 关 键 词： | 走时层析成像 CT 费马原理 加权有向图 地震勘探 |
An Improved Algorithm for Travel Time Tomopraphy |
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| Ma Ning, Hu Zhengyi, Tang Xueguan and Wang Yanping.An Improved Algorithm for Travel Time Tomopraphy[J].Computerized Tomography Theory and Applications,1995,4(4):43-49. |
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| Authors: | Ma Ning Hu Zhengyi Tang Xueguan and Wang Yanping |
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| Abstract: | Traveltime tomography is a technique to reconstruct acoustic, seismic, orelectromagnetic wave-speed distributions from first arrival traveltime data. The my paths thatshould be used for tomographic techniques strongly depend on the wave-speed distribution. Inthis paper, a new method is proposed for finding out the ray paths by using Fermat's prindple, that means the traveltime of the ray path should be a minimum value. The problem offinding out the ray path is actually an optdrium problem. Our new method uses the idea to findout the shortest path in a weighted directed graph to solve this problem. The my paths found out by this method are used in the iterative reconstruction procedure. Computer simulation results produced by this reconstruction algorithm are better than that by the conventional ones. It also shows that the new algorithm is effective with good convergence and stability. |
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| Keywords: | s: traveltime tomography Fermat's principle weighted directed graph |
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