Cohen A M, Linney A D, Reece B
Orthodontic Department, U.C.L. Dental School, London.
Br J Orthod. 1988 May;15(2):79-86. doi: 10.1179/bjo.15.2.79.
Variation in head position in the cephalostat is a potential source of error in cephalometrics as it causes distortion of the radiographic projection of the head. Image subtraction is an electronic technique enabling images to be superimposed and which highlights any differences. Using this method, a study was carried out to assess the reproducibility of the position of the head in the cephalostat. It was also used to find out whether subjects could improve their own head relocation by looking at the monitor and trying to achieve the best possible fit on the original image.
头影测量仪中头部位置的变化是头影测量中误差的一个潜在来源，因为它会导致头部X线投影的失真。图像减法是一种电子技术，可使图像叠加，并突出显示任何差异。使用这种方法，开展了一项研究以评估头影测量仪中头部位置的可重复性。它还被用于查明受试者通过查看监视器并尝试在原始图像上实现最佳匹配是否能够改善自身头部的重新定位。
