目的：探讨腹部摄影自动曝光控制探测点组合选择。
Objective:Investigate the component pattern of detecting points in automatic expo-sure control of abdomen radiography.
材料和方法：研究分三部分，第一部分：探讨常规曝光剂量扫描条件下，影响肺结节检出的因素。
Material and method: We divide our research into three parts. The first part: Investigate the factors influencing lung nodules being detected by standard exposing dose.
此外，还探讨了过曝光理论与稳定线宽的相互关系。
The relationship between stabilizing linewidth and overexposure theory is also discussed.
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