【摘要】 利用声波、地震波CT中广泛应用的SIRT法对BPT法进行改进,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)在改进型BPT法中权值最大,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,改进型SIRT法可有效抑制野外资料的外界干扰影响。通过实例验证,用改进型SIRT法得到的CT成果与实际吻合。更多还原

【Abstract】 Using the SIRT method which is widely used in acoustic and seismic wave CT to modify BPT and using "dij/li" to replace "dij" as the weight of i ray in j meshes,so that the weight of minor dij(dij=li) in modified BPT method becomes the maximum.Assuming the results of this calculation is the initial value in the CT reflected calculation,and integrating the BPT into SIRT,letting the rays and meshes meet the rule of "approximation is optimal" ,the modified SIRT method will effectively bring the external interference to the filed data.The case here demonstrates that the CT results by modified SIRT method cope well with the reality.更多还原