束电流与束电压确定，存在最佳的磁场使离子噪声幅度最小。

There exists on optimal value of magnetic focusing field and beam voltage, which can minimize the ion noise amplitude.

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项目实施后，噪声绝对值降低了20分贝，噪声幅度降低达24%。

After the projects put into effect, the noise absolute value reduced by 20 decibels, and the noise rang decreased by 24%.

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实验结果表明，该算法可以有效地增强图像的细节信息，减小噪声的增强幅度，改善图像的视觉效果。

Experiment result shows that this algorithm avoids over-enhancement of noise while enhancing image details with good visual effect.

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