定义一个严格的序列，比如在瀑布模型中，与在并行工作中定义一个半排序的迭代序列是基本相同的。
Defining a strict sequence, as in a waterfall model, is just as much a process as defining a semi-ordered sequence of iterations in parallel work.
给出了动力半显式算法的迭代格式和收敛标准。
The iterative format and the convergence criteria of this algorithm are presented.
提出了基于直接螺旋半扫描数据的有序子集期望最大化（OSEM）迭代重建。
This paper proposed a modified ordered subsets expectation maximization(OSEM) reconstruction based on the direct helical half-scan data.
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