噪声对数字化咬合翼片X线片龋病检测的可压缩性及诊断准确性的影响。

Effect of noise on the compressibility and diagnostic accuracy for caries detection of digital bitewing radiographs.

作者信息

Janhom A, van der Stelt P F, van Ginkel F C, Geraets W G

机构信息

Department of Oral Radiology, Academic Centre for Dentistry Amsterdam (ACTA), The Netherlands.

出版信息

Dentomaxillofac Radiol. 1999 Jan;28(1):6-12. doi: 10.1038/sj.dmfr.4600397.

DOI:10.1038/sj.dmfr.4600397

PMID:10202472

Abstract

OBJECTIVES

To determine the effect of noise on the compressibility and the diagnostic accuracy for caries detection of digital bitewing radiographs.

METHODS

Bitewing radiographs of patients were obtained with a storage phosphor (Digora, Soredex, Helsinki, Finland) and compressed at different JPEG compression levels (2, 27, 53 and 128). A just noticeable difference study was performed to select a compression level to study the added noise effect. Gaussian noise was added at low, medium, and high levels to both the original and compressed images. Seven observers examined the selected approximal surfaces to identify the caries depth. ROC analysis was performed together with ANOVA at P = 0.05.

RESULTS

The compressibility of the images decreased as the noise level increased. ROC analysis revealed no significant difference between the original and compressed images within the same noise level (P > 0.06). With added noise compressed/decompressed images had a higher Az than the corresponding original images.

CONCLUSIONS

JPEG compression at level 27 can be used without a significant deterioration in diagnostic accuracy. Compression at this level seemed to reduce the effect of noise to some extent.

摘要

目的

确定噪声对数字咬合翼片X线片的可压缩性及龋病检测诊断准确性的影响。

方法

使用存储磷光体（Digora，Soredex，芬兰赫尔辛基）获取患者的咬合翼片X线片，并在不同的JPEG压缩水平（2、27、53和128）下进行压缩。进行一项恰可察觉差研究以选择一个压缩水平来研究附加噪声的影响。对原始图像和压缩图像均添加低、中、高三种水平的高斯噪声。七名观察者检查所选邻面以确定龋病深度。在P = 0.05时进行ROC分析并结合方差分析。