OBJECTIVE:To propose a maximum a posteriori (MAP) reconstruction algorithm based on exponential prior distribution for noise suppression METHODS:Exponent prior distribution replaces the Gaussian of traditional MAP,and the reconstruction image is tested with signal-to-noise and root mean squared error.
目的:针对MLEM算法的图像噪声问题,提出一种基于指数型先验分布约束的MAP重建算法。 方法:将指数先验分布代替传统MAP重建中的高斯先验,并用信噪比和归一化均方误差来判断重建质量。
参考来源 - 一种基于指数型先验分布的正电子发射断层图像重建算法The general process for Bayes analysis is:prior distribution+data=posterior distribution.
Bayes分析的一般程序是先验分布+数据=后验分布。
参考来源 - 可靠性评估中利用先验信息的一种新思路·2,447,543篇论文数据,部分数据来源于NoteExpress
The posterior robustness of the fusion prior distribution based on this method is also considered.
讨论了由该方法得到的融合先验分布的后验稳健性问题。
The hierarchical prior distribution of failure rate was determined based on reliability acceptance test data.
保证试验是近年来引起可靠性工程界广泛重视的一种可靠性验收试验方法。
The method of using history test datum to make prior distribution and d-s evidence fusion theory are discussed.
讨论了由历史试验数据确定先验分布的方法和多源信息的D—S证据融合方法。
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