工业CT作为一种先进的无损检测手段，可以有效地检测零件的内外部结构情况，对扫描得到的工业CT图像进行二值化，将图像目标和背景分离，然后进行轮廓跟踪，识别出图像的外轮廓和内轮廓，并将内外轮廓数据拟合成样条曲线，最后进行虚拟测量。结果表明，该方法可以测量内外轮廓沿x，y方向以及任意方向的尺寸。

Industrial CT can effectively detect the parts in shape and appearance as an advanced nondestructive test method. A series of industrial CT images can be got after the part is scanned by industrial CT equipment. The industrial CT image is binary-coded, so the target and background are separated. Then the outer contour and inner contour are identified by contour tracking and the data of the outer contour and inner contour are fitted as spline curves. Finally, virtual measurements are used to get the dimensions of the outer contour and inner contour along the x direction, the y direction and the arbitrary direction.