Interaction between noise and file compression and its effect on the recognition of caries in digital imaging

被引:23
作者
Janhom, A
van der Stelt, PF
van Ginkel, FC
机构
[1] Acad Ctr Dent Amsterdam, Dept Oral Radiol, NL-1066 EA Amsterdam, Netherlands
[2] Acad Ctr Dent Amsterdam, Dept Informat Technol, NL-1066 EA Amsterdam, Netherlands
关键词
digital imaging; dental; imaging processing; computer-assisted; perception; ROC curve;
D O I
10.1038/sj.dmfr.4600488
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Objectives: To determine the interaction between image noise and file compression, with special emphasis on the accuracy of caries diagnosis. Methods: Fifty-nine bitewing radiographs of patients were taken simultaneously with Ektaspeed Plus (Eastman-Kodak, Rochester, NY, USA) film without lead foil and the Digora(R) storage phosphor system (Soredex, Helsinki, Finland). Three different levels of Gaussian noise were added to the original digital images which were then compressed with JPEG 53. Seven observers evaluated the presence and depth of caries lesions on selected approximal surfaces on a 5-point scale. The results of JPEG 27 compression from a previous study were also included. ROC analysis was used together with multivariate analysis of variance (MANOVA). Results: JPEG 27 and 53 reduced the file size down to 7% and 4.6% of the original respectively. ROC curve analysis showed no significant difference between image conditions (original, JPEG 27, and JPEG 53) at the same noise level. JPEG 27 and 53 had larger A, scores than their original counterparts at the same noise level. However, MANOVA. showed that for depth estimation of enamel lesions JPEG 53 resulted in a higher observer error. Conclusions: Both JPEG 53 and 27 could reduce some of the adverse effect of noise from the image by removing high spatial frequencies. JPEG 53, resulting in a compression ratio of 1:21, does not compromise the diagnostic performance in general. JPEG 53 compression may however affect the ability to detect enamel lesions.
引用
收藏
页码:20 / 27
页数:8
相关论文
共 11 条
[1]   Effect of noise on the compressibility and diagnostic accuracy for caries detection of digital bitewing radiographs [J].
Janhom, A ;
van der Stelt, PF ;
van Ginkel, FC ;
Geraets, WGM .
DENTOMAXILLOFACIAL RADIOLOGY, 1999, 28 (01) :6-12
[2]   CONSENSUS METHODS FOR MEDICAL AND HEALTH-SERVICES RESEARCH [J].
JONES, J ;
HUNTER, D .
BRITISH MEDICAL JOURNAL, 1995, 311 (7001) :376-380
[3]  
Metz C.Z., 1984, INFORMATION PROCESSI, P432
[4]   QUANTIFICATION OF FAILURE TO DEMONSTRATE STATISTICAL SIGNIFICANCE - THE USEFULNESS OF CONFIDENCE-INTERVALS [J].
METZ, CE .
INVESTIGATIVE RADIOLOGY, 1993, 28 (01) :59-63
[6]   An analytical look at the effects of compression on medical images [J].
Persons, K ;
Palisson, P ;
Manduca, A ;
Erickson, BJ ;
Savcenko, V .
JOURNAL OF DIGITAL IMAGING, 1997, 10 (03) :60-66
[7]   A comparison of a film-based and a direct digital dental radiographic system using a proximal caries model [J].
Price, C ;
Ergul, N .
DENTOMAXILLOFACIAL RADIOLOGY, 1997, 26 (01) :45-52
[8]  
SANDERINK GCH, 1997, ADV MAXILLOFACIAL IM, P299
[9]  
Stheeman S E, 1995, Community Dent Health, V12, P194
[10]  
VANDERSTELT PF, 1997, J DENT RES, V76, P140