Inaba D, Takagi O, Arends J
Department of Preventive Dentistry, Nagasaki University School of Dentistry, Japan.
Eur J Oral Sci. 1997 Feb;105(1):74-80. doi: 10.1111/j.1600-0722.1997.tb00183.x.
A computer-assisted videodensitometry (CAV) method is presented for the microradiographical mineral determination and mineral visualization of in vitro and in vivo formed dentin lesions. The method employs as essential steps (1) image digitizing by a CCD camera, (2) conversion of gray values to equivalent aluminium thicknesses and (3) conversion of aluminium thickness to vol% of mineral. Procedure and accuracy are described. The CAV method is illustrated for dentin lesions formed in vitro as well as for clinical root caries lesions. The CAV method is especially advantageous for clinical lesions because it can be employed for very complex mineral distributions and irregular lesion outlines. In given areas of interest, the mineral distribution (in vol%) can be plotted in 3D form in pseudo-colors. Conventional microradiographical profiles can be obtained directly from the CAV images. For in vitro lesions, the mineral distribution parameters, lesion depth, mineral loss, and mineral acquisition values can be generated from CAV images with a reproducibility of better than 7%. The CAV method is a valuable tool in quantitative mineral studies of clinical lesions in extracted teeth as well as in in situ lesion investigations.
本文介绍了一种计算机辅助视频密度测定法（CAV），用于体外和体内形成的牙本质病变的显微放射成像矿物测定和矿物可视化。该方法的基本步骤包括：（1）用CCD相机进行图像数字化；（2）将灰度值转换为等效铝厚度；（3）将铝厚度转换为矿物的体积百分比。描述了该方法的步骤和准确性。文中展示了CAV方法用于体外形成的牙本质病变以及临床根龋病变的情况。CAV方法对临床病变特别有利，因为它可用于非常复杂的矿物分布和不规则的病变轮廓。在给定的感兴趣区域，矿物分布（以体积百分比表示）可以三维形式用伪彩色绘制。常规的显微放射成像剖面图可直接从CAV图像获得。对于体外病变，矿物分布参数、病变深度、矿物损失和矿物获取值可从CAV图像生成，其重现性优于7%。CAV方法是研究拔牙临床病变定量矿物以及原位病变的宝贵工具。
