Tourne L P
Angle Orthod. 1996;66(6):433-40. doi: 10.1043/0003-3219(1996)066<0433:AOACAD>2.3.CO;2.
A commercially available digitizer has been tested for accuracy. The various areas of the digitizing tablet show degrees of precision that can differ for the x- and y-coordinates. The tablet has a mean absolute error of 0.016 mm for the x-coordinate and 0.09 mm for the y-coordinate. Error tended to increase toward the sides of the tablet. Partitioning the error into systematic and random components revealed that the x-error is due mainly to errors in linearity of the digitizer. When compared with the error involved in locating cephalometric landmarks, one can conclude that this type of digitizer is suited for orthodontic purposes. This article describes a new methodological approach to locating and measuring errors in linearity.
已对一款市售数字化仪的准确性进行了测试。数字化绘图板的各个区域显示出不同的精度程度，x 坐标和 y 坐标的精度可能有所不同。该绘图板 x 坐标的平均绝对误差为 0.016 毫米，y 坐标的平均绝对误差为 0.09 毫米。误差在绘图板边缘处往往会增大。将误差分为系统误差和随机误差成分后发现，x 误差主要是由于数字化仪线性度方面的误差所致。与确定头影测量标志点所涉及的误差相比，可以得出结论，这种类型的数字化仪适用于正畸目的。本文描述了一种用于定位和测量线性度误差的新方法。
