The weak estimate of the first type is derived by using the properties of the interpolation operator of projection type.

借助投影型插值算子的性质得出了二次奇妙族元第一型弱估计。

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In the back-projection process of the FDK algorithm, every voxel s project distribution in the detector have itself characteristics, This paper presents a new interpolation method.

针对在fdk算法的反投影过程中，各个体素在探测器上投影分布的特点，本文提出一种新的插值方法。

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