Visually detectable resolution of intraoral dental films
Visually detectable resolution of intraoral dental films
复制标题
DOI：
10.1259/dmfr/22478778
复制
发表时间：
2003-11-01
影响因子：
3.3
通讯作者：
Becker, J
中科院分区：
文献类型：
--
作者：
K端nzel, A;Scherkowski, D;Becker, J
目的：用肉眼检查口内牙片的视觉可用分辨率，使用两倍光学放大率并在使用计算机显示器数字化后进行检查。方法：Agfa Dentus M2（R）、Kodak Ektaspeed Plus（R）和Kodak InSight（R）牙片使用线对（1 p）测试图案曝光，提供高达16.6 1 p mm（-1）的频率。在24 ℃下在Durr Periomat机器中和在28 ℃下在Durr AC 245机器中使膜显影。40名牙科学生用裸眼、X射线观察器（R）（提供两倍放大镜并消除干扰光）和数字化和显示器显示检查评估了最大视觉可检测分辨率。结果：通过数字化实现了最佳可检测分辨率，平均可达16.5 1 p mm（-1）。在2倍放大下，平均可分辨13.3 1 p mm（-1），而肉眼只能分辨11.7 1 p mm（-1）。与其他类型的胶片不同，Ektaspeed的分辨率取决于观看数字化图像或肉眼观看时的处理类型。有一种趋势，29岁以上的学生检测到一个较低的分辨率与肉眼，虽然他们进行了与学生低于29岁时，使用X射线观察器（R）或观看数字化images.Conclusions：胶片分辨率利用最好通过数字化，其次使用放大透镜。用肉眼可以分辨出平均11 1 p mm（-1）的宽分布。如果分辨率很重要或观看者的视力下降，建议使用放大透镜。与E-speed胶片相比，Kodak Insight对冲洗条件的依赖性较小。
Objectives: The visually utilizable resolution of intraoral dental films was examined with the naked eye, with two-fold optical magnification and after digitization using a computer display.Methods: Agfa Dentus M2(R), Kodak Ektaspeed Plus(R) and Kodak InSight(R) dental films were exposed with a line pair (1p) test pattern providing frequencies up to 16.6 1p mm(-1). Films were developed at 24degreesC in a Durr Periomat machine and at 28degreesC in a Durr AC245 machine. Forty dental students evaluated the maximum visually detectable resolution with their naked eye, with an X-ray viewer(R) (providing two-fold magnifying lenses and eliminating disturbing light) and following digitization and monitor display examination.Results: The best detectable resolution was achieved through digitization, reaching a mean of up to 16.5 1p mm(-1). With two-fold magnification, a mean of up to 13.3 1p mm(-1) could be resolved, while only 11.7 1p mm(-1) could be resolved with the naked eye. Unlike the other film types, the resolution of Ektaspeed depended on the processing type when viewing digitized images or when viewing with the naked eye. There was a trend for students above 29 years of age to detect a lower resolution with the naked eye, although they performed comparably with students below 29 years when using the X-ray viewer(R) or viewing digitized images.Conclusions: Film resolution is utilized best through digitization and secondly using a magnifying lens. With the naked eye, a mean of 11 1p mm(-1) with a broad distribution can be resolved. A magnifying lens is recommended if resolution is important or if the viewer's eyesight is reduced. Compared with E-speed films, Kodak Insight was less dependent on processing conditions.