A FILTERED BACK-PROPAGATION ALGORITHM FOR DIFFRACTION TOMOGRAPHY
A FILTERED BACK-PROPAGATION ALGORITHM FOR DIFFRACTION TOMOGRAPHY
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DOI：
10.1016/0161-7346(82)90017-7
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发表时间：
1982-01-01
影响因子：
2.3
通讯作者：
DEVANEY, AJ
中科院分区：
文献类型：
--
作者：
DEVANEY, AJ
本文推导了一种平行光束透射式计算机层析成像的重建算法，该算法通过二维结构，其中必须考虑穿透光束的衍射。该算法被发现是完全类似于传统的透射层析成像的滤波反投影算法，除了反投影操作必须由backpropagationprocess代替，由此在对象外部的线上测量的场的复相位被制作成通过对象空间来传播。该算法适用于第一玻恩或Rytov近似内的衍射层析成像。本文还讨论了该算法在三维结构中的应用。
A reconstruction algorithm is derived for parallel beam transmission computed tomography through two-dimensional structures in which diffraction of the insonifying beam must be taken into account. The algorithm is found to be completely analogous to the filtered backprojection algorithm of conventional transmission tomography with the exception that the backprojection operation has to be replaced by a backpropagationprocess whereby the complex phase of a field measured over a line outside the object is made topropagateback through the object space. The algorithm is applicable to diffraction tomography within either the first Born or Rytov approximations. Application of the algorithm to three-dimensional structures is also discussed.