It is an effective way for improving quality of reconstructed images that projection data are optimized in the field of Computerized Tomography (ct).

在计算机层析技术(CT)中，优化投影数据是改善重建图象质量的有效途径。

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Now the existing direct volume CT methods face two difficulties:first, how to get the projection data to reconstruct the 3D image exactly, including whether the scanning structure is practical;

目前直接体积CT主要存在两大困难：一是如何获得三维图像精确重建所需的投影数据，包括扫描方式的可实现性；

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Now the existing direct volume CT methods face two difficulties:first, how to get the projection data to reconstruct the 3D image exactly, including whether the scanning structure is practical;

目前直接体积CT主要存在两大困难：一是如何获得三维图像精确重建所需的投影数据，包括扫描方式的可实现性；

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