It is important to select suitable sampling space and projection data for reducing cost and improving the image reconstruction efficiency in convolution backprojection algorithm.

利用卷积反投影算法对图像进行重建时，要降低成本，提高成像效率，就必须选取合理的抽样间距和投影数。

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Select 6 images for projection and discussion during class and bring them with you.

挑选出六张幻灯片并携带至课堂，供课堂投影以及讨论。

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Select 6 slides for projection and discussion during class and bring them with you to class.

挑选出六张幻灯片并携带至课堂，供课堂投影以及讨论。

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At their own terminals, teachers can monitor the work of all the students, or select a particular work-in-progress for high-definition video projection onto a large screen.

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