改进型SIRT法进行CT反演的应用
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摘要
本文通过采用广泛运用于声波、地震波CT中的SIRT法,对BPT法作了一些改进,用"dij/li"替换"dij"作为第i条射线在第j个网格中的权值,使那些较小的dij(dij=li)在传统的BPT法中权值微小,而在改进型BPT法中却有最大的权值,用其计算结果作为CT反演计算的初值,同时将BPT法融合到SIRT法中去,使射线与网格符合"近则优"的原则,称之为改进型SIRT法,能起到有效压制野外资料外界干扰的影响,在实际应用中已取得明显效果。
The paper improved the BPT method that widely used in SIRT method of sonic and seismic wave CT method.Using "dij/li"to replace "dij"and be as weight of ith ray in jth grid,making the minor dij(dij=li) have max weight in improved BPT method,while in traditional BPT method the minor dij(dij=li) has smaller weight.Using their computational results to be initial value of CT inversion and merging the BPT method into SIRT method,which make the rays and grids conform to the principle of "the nearest being the best",which is called as improved SIRT method that can effectively suppress the influence of outdoor interference on field data and achieved significant effect in practical application.
The paper improved the BPT method that widely used in SIRT method of sonic and seismic wave CT method.Using "dij/li"to replace "dij"and be as weight of ith ray in jth grid,making the minor dij(dij=li) have max weight in improved BPT method,while in traditional BPT method the minor dij(dij=li) has smaller weight.Using their computational results to be initial value of CT inversion and merging the BPT method into SIRT method,which make the rays and grids conform to the principle of "the nearest being the best",which is called as improved SIRT method that can effectively suppress the influence of outdoor interference on field data and achieved significant effect in practical application.
引文
1刘润泽.改进型SIRT法———压制噪声的一种有效方法.工程物探,1995(1)
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4顾孝同.国内工程CT技术的发展与应用.工程地球物理学报,2006,3(4)
5李承华.透射层析成像中完全投影数据的获取.淮南矿业学院学报,1997,17(4)
6杜剑渊,杨文采.跨孔地震层析成像的级联方法.地球物理学报,1991,3(6)
7李晓芹,陶裕录,冯锐.电阻率层析成像的原理与初步应用.地震地质,1998,20(3)
8 Ki Ha Lee,Ganquan Xie.A new approach to imagingwith low-frequency electromagnetic fields.Geophysics,1993,58(6)
9 Thomas Mensch Veronique etc.P-wave Tomography inInhomogeneous Orthorhombic Media Pure and Applied.Geophysics,2002
2王兴泰.工程与环境物探新方法新技术.地质出版社,1996年4月
3关家骥,李云甫,雷宝瑶,武坤.概率统计.湖南科学技术出版社,1993年12月
4顾孝同.国内工程CT技术的发展与应用.工程地球物理学报,2006,3(4)
5李承华.透射层析成像中完全投影数据的获取.淮南矿业学院学报,1997,17(4)
6杜剑渊,杨文采.跨孔地震层析成像的级联方法.地球物理学报,1991,3(6)
7李晓芹,陶裕录,冯锐.电阻率层析成像的原理与初步应用.地震地质,1998,20(3)
8 Ki Ha Lee,Ganquan Xie.A new approach to imagingwith low-frequency electromagnetic fields.Geophysics,1993,58(6)
9 Thomas Mensch Veronique etc.P-wave Tomography inInhomogeneous Orthorhombic Media Pure and Applied.Geophysics,2002
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