A COMPUTER-SIMULATION STUDY OF DIFFRACTION TOMOGRAPHY
A COMPUTER-SIMULATION STUDY OF DIFFRACTION TOMOGRAPHY
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DOI：
10.1109/tbme.1983.325037
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发表时间：
1983-01-01
影响因子：
4.6
通讯作者：
DEVANEY, AJ
中科院分区：
文献类型：
--
作者：
DEVANEY, AJ
作者最近开发的X射线断层扫描的滤波反投影算法和衍射断层扫描的滤波反向传播算法在Rytov近似有效的二维物体超声断层扫描的计算机模拟中进行了测试。研究发现，即使对于比物体变化的最小尺度小得多的波长，滤波反投影算法也给出了不令人满意的结果。在所有研究的情况下，滤波反向传播算法都会产生高质量的重建，这些重建只是实际对象轮廓的低通滤波版本。结果表明，滤波反向传播算法可以通过修改后的反向投影算法来近似，该算法具有与滤波反向投影基本相同的计算要求，但产生明显更高质量的对象重建。
The filtered backprojection algorithm of X-ray tomography and the filtered backpropagation algorithm developed recently by the author for diffraction tomography are tested in computer simulations of ultrasonic tomography of two-dimensional objects for which the Rytov approximation is valid. It is found that the filtered backprojection algorithm gives unsatisfactory results even for wavelengths much smaller than the smallest scale over which the object varies. The filtered back-propogation algorithm yields, in all cases studied, high-quality reconstructions which are simply low-pass filtered versions of the actual object profile. It is shown that the filtered backpropagation algorithm can be approximated by a modified backprojection algorithm having essentially the same computation requirements as filtered backprojection, but yielding considerably higher quality object reconstructions.