A modified fractal zone plate (FZP) with the character of extending the focal depth is proposed.

提出了一种具有增大焦深特性的改进型分形波带片(fzp)。

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The etched depth profile of enamel surface was tested by SEM and digitized by image analysis to detect the roughness of enamel. And the fractal dimension could quantify the roughness.

针对牙齿美白剂对牙釉质表面结构之影响，以扫描式电子显微镜，结合影像 分析进行碎形维度分析，将粗糙度（roughness）量化，再以接触角测试分析牙齿 表面的粗糙程度对于亲水性的影响；

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