To avoid the effect of cumulate error in conventional iterativereconstruction algorithms, a linear rewound method is put forward.
为了避免迭代式重建策略所存在的累积误差效应，提出了一种线性回溯射影结构恢复策略。
2
Unfortunately, up to now, there is no an efficient algorithm to deal with the iterativereconstruction algorithm, especially from fan-scanned projections.
对于迭代重建，目前尚无很好地解决该问题的算法，特别是对扇束投影重建问题。
3
Moreover, as will be discussed subsequently, advancements in iterativereconstruction methods for ct should result in further reductions in radiation exposure.