结论：在螺旋CT模拟扫描中，采用薄层的重叠重建在肿瘤靶区体积的制定中是切实可行的。
Conclusion: in spiral ct simulator scan, using overlapping reconstruction with thin slice is advisable in determining gross target volume of tumor.
利用激光辐照区内脉冲重叠或累积曝光量的差异解释了扫描速度的影响。
The influence of scanning velocity is explained based on different pulses overlapping or cumulative dose of laser exposure in irradiated area.
深入分析了捕获概率，提出了覆盖概率下扫描点重叠因子的计算方法。
Through analyzing the scan area coverage probability, the overlap factor calculation method is proposed.
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