Better precision X ray tube, and wider analysis scope, long lifetime up to 10 years.
激发源X射线光管精度更高，范围更宽，使用寿命长达10年以上；
Conclusion: From 1997 to 2004, the comprehensive occurrence possibility and Nerve Tube Defects (NTDs) occurrence possibility appear a decrease trend year by year, moreover, the scope keep the same.
结论：我省1997到2004年出生缺陷监测出生缺陷总发生率和神经管畸形发生率均呈逐年下降趋势，且下降幅度基本一致。
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