Production processes are often subject to the regulations of the U.S. Food and Drug Administration (FDA). The measurement task consists of the output and defects detection of strut width, radius, angle, material thickness. Because the intersection is very small at the micrometer level, the level of measurement inaccuracy is high. The stent is required for 100% testing, so the measurement time is very high. The uniformity of the strut shape is directly related to the expansion performance within the vessel, so that when a rotation-switch axis and raster scanning are combined, the entire stem can be efficiently examined.
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