衍射CT技术和多源全息成象技术的比较研究

在本文中,我们从理论上比较研究了衍射CT技术和多源全息成象技术,讨论了在弱不均匀介质中多源全息成象技术失真的根源,推导出二维多源全息图象重建的快速算法,利用这些算法和计算机产生的非Born近似的正演数据,系统地研究了异常体的尺寸、异常程度的大小和数据采集方式对重建图象的影响.并且把它与衍射CT重建图象作了数值上的比较,所得到的许多结果（见正文结论部分）对于衍射地震CT技术和多源全息成象技术在生产中的应用有着指导意义.

A COMPARATIVE STUDY BETWEEN THE DIFFRACTION SEISMIC TOMOGRAPHY AND THE MULTISOURCE HOLOGRAPHY

In this paper, a theoretical comparision between the diffraction tomography and the mu-Itisource holography is given, the origin of the large distortion in multisource holography in weak inhomogeneous medium is studied and a fast algorithms of multisource holography is formulated. Using the reconstruction algorithms and computer generated data, we have systematically studied the three factors that can affect the reconstructed images, namely: (1) data acquisition configuration, (2) the dimension and (3) the abnormality of the abnormal structures, in the multisource holographic imaging process and these are one by one compared with those in diffraction tomography. All results obtained (see text) have far-reaching implications in the application of diffraction tomography and multisource holography to industrical exploration.