Iterative image reconstruction for positron emission tomography: a study of convergence and quantitation problems
Iterative image reconstruction for positron emission tomography: a study of convergence and quantitation problems
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正电子发射断层扫描的迭代图像重建：收敛和定量问题的研究
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
L. Eriksson
中科院分区：
文献类型：
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作者：
S. Holte;P. Schmidlin;A. Linden;G. Rosenqvist;L. Eriksson
迭代重建技术已被证明具有上级噪声特性相比，传统的滤波反投影（FB）。迭代方法的主要缺点是增加了计算负担，并且难以建立停止标准和确保在不同成像情况下的适当定量。使用技术的组合，它已经有可能减少迭代重建所需的时间，FB的几倍。FB的定量属性进行了比较，添加剂和乘法迭代公式，包括最大似然法。在没有加速的情况下，所有三种测试方法在40次迭代后都给出了定量结果，而不管数据中的计数数量。然而，对于有噪声的数据，最小二乘意义上的最佳图像通常在10-20次迭代后获得。>
Iterative reconstruction techniques have been shown to have superior noise characteristics compared to conventional filtered backprojection (FB). The main drawbacks of the iterative methods are the increased computational burden and the difficulty in establishing a stopping criterion and ensuring proper quantitation in different imaging situations. Using a combination of techniques, it has been possible to reduce the time required for iterative reconstruction to a few times that of FB. The quantitation properties of FB have been compared to those of additive and multiplicative iteration formulas, including the maximum likelihood method. Without acceleration, all three tested methods gave quantitative results after 40 iterations, regardless of the number of counts in the data. However, with noisy data, the best images in a least-squares sense were typically obtained after 10-20 iterations. >