This paper proposed a modified ordered subsets expectation maximization(OSEM) reconstruction based on the direct helical half-scan data.

提出了基于直接螺旋半扫描数据的有序子集期望最大化（OSEM）迭代重建。

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The validity of half-scan mode was verified by the results of computer simulation and experiments.

计算机模拟和实验结果证明了该技术的正确性。

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In 2005, Microsoft announced that it would spend two and a half million dollars to scan a hundred thousand out-of-copyright books in the collection of the British Library.

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Only four months after launch, refill-by-scan accounted for more than half of all prescriptions ordered through Walgreens mobile applications.

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About half of children who go to the ER with head injuries get this radiation-heavy scan, and clinical observation first could help some who don't really need a CT avoid it.

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