融合点测量信息的光学层析方法

姚卫; 李振华; 贺安之

光学学报, 2000, 20 (5): 684, 网络出版: 2006-08-09

融合点测量信息的光学层析方法

Algebraic Reconstruction Technique Fused with Pointwise Measurement

论文大纲

姚卫李振华贺安之

作者单位

南京理工大学应用物理系,南京 210094

光学计算机层析术代数迭代法先验信息融合。 optical computerized tomography (OTC) algebraic reconstruction information fusing.

摘要

光学计算机层析术的困难在于不能得到足够的信息以完全确定探测目标。理论上,将先验知识融入层析术可以在一定程度上降低病态程度,而实际中场的一组孤立点的测量值是一种更为直接的可得信息。利用ART3算法对于含噪声、甚至部分缺失的投影数据具有很好的鲁棒性,并且能友好地融合来自其他测量系统的信息的特点,提出一种利用点测量信息的自适应方法,避免了对重建过程引入原本不存在的高频信息,以及在迭代过程中对预期的低频分量的过抑制,保证系统的稳定。并在数值模拟实验中进一步强调先验知识在光学计算机层析术中的应用。

Abstract

These isolated point measurements deserve pertain roles in the OCT reconstruction.The ART3 algorithm is a robust method dealing with practically noisy or even partly missing projections,and is friendly to integrate the information from various sources.Most of the suggestions on fusing information inevitably introduce high frequencies,which never exist in the field,into the interation.And these high frequencies over-suppress the expected low frequency components and cause the reconstraction non-stable.An adaptive way is developed to take a good use of pointwise priori.By analyzing the simulated experiments,some deserved attention to the application of priori in OCT is strongly suggested.

参考文献

[1] Sweeney D W,Vest C M.Measurement of three-dimensional temperature fields above heated sources by holographic interferometry.Int.J.Heat Mass Transfer,1974,17:1443～1454

[2] Zhang Y,Ruff G A.Interferometric tomography investigation of three-dimensional natural convective flows.AIAA 94-0278,32nd Aerospace Sciences Meeting & Exhibit,Reno: AIAA,1994.1～25

[3] Natterer F,Teubner B G.The Mathematics of Computerized Tomography.Stuttgart: Wiley,1986.158～179

[4] Cha D J,Cha S S.Holographic interferometric tomography for practical ill-posed reconstruction from severely limited data.AIAA 95-2194,26th AIAA Fluid Dynamics Conference,San Diego,CA:AIAA,1995.1～37

[5] Censor Y.Row-action methods for huge and sparse systems and their application.SIAM Review,1981,22(4):444～466

[6] Goffin J L.On the finite convergence of the relaxation method for solving systems of inequalities.Numerical Method for Constrained Optimization,in Gill P E,Murray W,eds.,New York: Academic,1974.167～206

[7] Herman G T.A relaxation method for reconstructing objects from noisy X-rays.International Biology Digest,1975,8:1～19

姚卫, 李振华, 贺安之. 融合点测量信息的光学层析方法[J]. 光学学报, 2000, 20(5): 684. 姚卫, 李振华, 贺安之. Algebraic Reconstruction Technique Fused with Pointwise Measurement[J]. Acta Optica Sinica, 2000, 20(5): 684.

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