Diagnostic accuracy of digitized dental radiographs

许多因素可以决定数字化口内X线片的诊断准确性。传统的胶片射线照片是用三种不同的数字化仪，激光扫描仪，鼓扫描仪和电视摄像机进行数字化的。数字图像，不同的像素大小和灰度级和图像处理，显示在三个不同的视频监视器和评估的10名牙医。早期邻面龋的可检测性被用作诊断准确性的指标，并通过受试者操作特征分析比较不同因素的影响。鼓扫描仪数字化的图像被认为具有最好的诊断准确性。足够的诊断准确性，可以达到低成本的视频监视器的个人电脑。出于诊断目的，发现像素大小为100 mm和32个灰度级的数字图像对于口内X线片是可接受的。这些结果提供了一个实用的指导，建立一个数字图像采集系统的任何口内X线片，减少对数据存储的要求到最低限度。

A number of factors may determine the diagnostic accuracy of digitized intraoral radiographs. Conventional film radiographs were digitized with three different digitizers, a laser-scanner, a drum-scanner, and a TV camera. Digital images, varying in pixel size and gray level and image processing, were displayd on three different video-monitors and assessed by 10 dentists. The detectability of incipient proximal surface caries was used as an index of the diagnostic accuracy and the effect of the different factors compared by means of receiver operating characteristic analysis. Image digitized by the drum-scanner were found to have the best diagnostic accuracy. Sufficient diagnostic accuracy could be attained on the low-cost video monitor of a personal computer. Digital images with a pixel size of 100mm and 32 gray levels were found to be acceptable for intraoral radiographs, for diagnostic purposes. These results provide a practical guide for establishing a digital image acquiring system for any intraoral radiographs, reducing demands on data storage to a minimum.