We select the special relaxation parameter and put the projection matrix into many blocks according to the projection angles in the reconstruction procedure.
在重建过程中采取对投影矩阵按投影角度分块的方法，选取特定的松弛参数。
We study the problem of image reconstruction more careful-ly, under the condition of limited projection angles, and give two kinds of extrapolated da-ta methods with practical sense.
比较详细地研究了在有限投影角条件下图像重建问题，给出了两种有实际意义的外推数据方法。
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