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Dentomaxillofacial Radiology (2003) 32, 45-49
© 2003 British Institute of Radiology
doi: 10.1259/dmfr/19650275

RESEARCH

Effect of data compression on proximal caries detection: observer performance with DenOptix® photostimulable phosphor images

T Pabla*,1, JB Ludlow1, DA Tyndall1, E Platin1 and M Abreu, Jr2

1 Oral and Maxillofacial Radiology, University of North Carolina, Chapel Hill, NC, USA; 2 Oral and Maxillofacial Radiology, Federal University of Santa Catarina, Florianopolis SC, Brazil

*Correspondence to: T Pabla, Assistant Professor, Diagnostic Sciences and Pathology, University of Maryland, Baltimore, Dental School Rm 4-G-03, 666 W Baltimore Street, Baltimore, MD 21201-1586, USA; E-mail: pablat{at}dental.umaryland.edu

Received 9 January 2002; revised 26 August 2002; accepted 29 August 2002

Objectives: To study the effect of lossy image compression on caries detection. Null hypothesis states no difference in caries detection efficacy among observers using original digital images versus images compressed at various rates of compression.

Methods: Digital images of 41 extracted posterior teeth were obtained with a storage phosphor DenOptix® (Gendex® DenOptix® Imaging system) system. Images were exported in Tagged Image File Format (TIFF) and compressed with Joint Photographic Experts Group File Interchange Format (JFIF), as provided by the software of the imaging system. The compressions options JFIF100%, JFIF75% and JFIF 50% resulted in reducing the image size to 1:2, 1:11 and 1:16, respectively. Eight observers evaluated the presence or absence of caries on a 5-point confidence scale. The actual caries status of each proximal surface was determined by ground section histology. Responses were evaluated by receiver operating characteristic (ROC) analysis. Areas under the curves (Az) were assessed using analysis of variance (ANOVA).

Results: The mean Az scores were 0.85 for original/uncompressed images, and 0.89 for JFIF100%, 0.88 for JFIF75% and 0.88 for JFIF50% images. These differences were not statistically significant (P=0.26). Differences between observers were also not statistically significant (P=0.12).

Conclusions: JFIF compression at the level of 1:16 can be used without significant deterioration in diagnostic accuracy for proximal caries detection.

Keywords: image processing, computer-assisted; image compression; dental caries




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