Forsyth D B, Shaw W C, Richmond S, Roberts C T
Orthodontic Department, Leeds Dental Institute, University of Leeds, England.
Angle Orthod. 1996;66(1):43-50. doi: 10.1043/0003-3219(1996)066<0043:DIOCRP>2.3.CO;2.
The aim of this study was to compare the diagnostic quality of conventional cephalometric radiographs with that of digital image counterparts. The random error associated with angular and linear measurements recorded on the digital images was greater than on the conventional radiographs. In addition, there was a systematic error producing statistically significant differences in the majority of angular and linear measurements between the digital images and the conventional radiographs. The errors that occurred with some measurements were of sufficient magnitude to be of clinical significance, particularly in a cephalometric situation where a high degree of accuracy is required. It is therefore suggested that, for digital imaging of cephalometric radiographs, a pixel matrix larger than 512 x 512 with more than 64 gray levels is required to maintain the diagnostic quality of the original radiograph.
本研究的目的是比较传统头影测量X线片与数字图像的诊断质量。数字图像上记录的角度和线性测量的随机误差大于传统X线片。此外，存在系统误差，导致数字图像和传统X线片之间的大多数角度和线性测量存在统计学显著差异。一些测量中出现的误差幅度足以具有临床意义，特别是在对头影测量精度要求很高的情况下。因此，建议对头影测量X线片进行数字成像时，需要一个大于512×512且具有64级以上灰度的像素矩阵，以保持原始X线片的诊断质量。
