方法对190例正常人，运用灰阶、彩色多普勒及高频超声检查LGA内径、最高流速、最低流速、平均流速、阻力指数和血流量。

Methods Total 190 normal subjects, 97 males and 93 females, were examined by gray scale, color Doppler and high frequency ultrasound to detect LGA.

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在凝固准稳态阶段，熔池熔深和半径变化较小，但表面最高温度、熔池流速急剧减小；凝固加速阶段则反之。

At quasi - state stage, the depth and radius of laser pool have small changes, but the highest surface temperature and velocity of molten pool decease rapidly.

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如果由于回流或操作者的错误引起泄露的话，它还可能造成最高的泄露流速。对于危险产品，这一点须充分考虑到。

It also creates the highest release flow rate potential due to downstream leakage or operator error, which should be adequately addressed for hazardous products.

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