比如，数据结构和访问方法专门针对位于主内存中的数据进行了优化。
For example, data structures and access methods are specifically optimized to work on data that is located in main memory.
提出一种可以在联合代数重建方法中快速计算投影系数矩阵并优化内存的方法。
An efficient way to compute projection coefficient matrix together with memory optimization is presented in this paper.
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