本研究抽取 30张定位X线头颅侧位片 ,对同一张描图的 14个项目进行了图形数字化法和手工法的重复测量 ,并对两方法的测量结果进行比较。发现手工法对大角度测量的可重复性优于描图的图形数字化法 ,手工法的劣势在于小角度的测量。两方法对线距测量的可重复性无差异 ;两方法之间对多于半数项目的测量存在统计学意义上的显著性差异 ,但这种差异一般没有临床意义。 In this study, 30 X-ray cephalometric slices were selected, and 14 items of the same tracing were digitally digitized and manually measured repeatedly, and the results of two methods were compared. It is found that the manual method is superior to the graph digitization method for high-angle measurement repeatability of tracing method. The disadvantage of manual method lies in the measurement of small angle. There was no significant difference between the two methods in repeatability of line-distance measurements; statistically significant differences were observed in more than half of the items between the two methods, but such differences were generally of no clinical significance.