NHS Tayside, Dundee Dental Hospital and School, 2 Park Place, Dundee, UK.
Eur J Orthod. 2012 Feb;34(1):57-61. doi: 10.1093/ejo/cjq158. Epub 2011 Feb 7.
The objective of this study was to determine whether the accuracy of measurement data from inverted greyscale digital cephalometric radiographs equals that obtained from conventional negative digital cephalometric radiographs. Fifty-five consecutively lateral cephalometric radiographs from a university orthodontic clinic obtained for treatment planning were used for this study. A 5 MB conventional negative 'bones white' and inverted greyscale 'bones black' TIFF digital image of each radiograph was produced. These were allocated a unique identifier and were analysed in random order by one clinician. Eighteen cephalometric landmarks were digitized using the Opal 2.1 package and the angles were calculated. The angular measurements were compared using two-sample t-tests (P < 0.05). The angular measurements from the conventional negative bones white and inverted greyscale bones black lateral cephalometric radiographs were neither statistically significantly different nor clinically different from each other. Therefore, measurements derived from conventional negative bones white and inverted greyscale bones black lateral cephalometric radiographs have a similar level of precision.
本研究旨在确定反转灰度数字头颅侧位片的测量数据的准确性是否等同于常规负片数字头颅侧位片。从大学正畸诊所为治疗计划获取的 55 张连续头颅侧位片用于本研究。为每个射线照片制作了一个 5MB 的常规负片“骨白色”和反转灰度“骨黑色”TIFF 数字图像。这些图像都分配了一个唯一的标识符，并由一名临床医生随机顺序进行分析。使用 Opal 2.1 软件包对 18 个头颅测量标志进行数字化，并计算角度。使用双样本 t 检验（P <0.05）比较角度测量值。常规负片“骨白色”和反转灰度“骨黑色”侧位头颅射线照片的角度测量值在统计学上没有显著差异，也没有临床差异。因此，源自常规负片“骨白色”和反转灰度“骨黑色”侧位头颅射线照片的测量值具有相似的精度水平。
