Effect of image magnification of digitized bitewing radiographs on approximal caries detection: an in vitro study.

Møystad, Anne; Svanaes, D B; Larheim, Tore A.; Gröndahl, Hans‐Göran

doi:10.1259/dmfr.24.4.9161171

Cited by 45 publications

(21 citation statements)

References 9 publications

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“…9 This finding was similar to our results, although another study also determined the upper limit of zoomed digital image to be 12 £ , 13 greater than the results of this study. The comparison between the present study with these papers is limited, however, because they are related to different tasks and the software used for capture and imaging interpretation is also different.…”

Section: Discussionsupporting

confidence: 89%

“…4 -7 The zooming function comes in a software for image magnification or reduction 8 and in some studies has been shown to provide improvement of the diagnosis efficacy of initial caries lesions 9,10 and detection of small endodontic files in relation to the radiographic apex. 11 However, the digital magnification did not affect the detection of root fractures 12 and both Moystad et al 13 and Scaf et al 9 showed the limitation of zoomed digital function for radiographic interpretation of caries lesions.…”

Section: Introductionmentioning

confidence: 95%

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Accuracy of zoomed digital image in the detection of periodontal bone defect:in vitrostudy

Morais

Sakakura²,

Loffredo³

et al. 2006

Dentomaxillofacial Radiology

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Objectives: (1) To evaluate the intraobserver agreement related to image interpretation and (2) to compare the accuracy of 100%, 200% and 400% zoomed digital images in the detection of simulated periodontal bone defects. Methods: Periodontal bone defects were created in 60 pig hemi-mandibles with slow-speed burs 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm and 3.0 mm in diameter. 180 standardized digital radiographs were made using Schick sensor and evaluated at 100%, 200% and 400% zooming. The intraobserver agreement was estimated by Kappa statistic (k). For the evaluation of diagnostic accuracy receiver operating characteristic (ROC) analysis was performed followed by chi-square test to compare the areas under ROC curves according to each level of zooming. Results: For 100%, 200% and 400% zooming the intraobserver agreement was moderate (k ¼ 0.48, k ¼ 0.54 and k ¼ 0.43, respectively) and there were similar performances in the discrimination capacity, with ROC areas of 0.8611 (95% CI: 0.7660 -0.9562), 0.8600 (95% CI: 0.7659 -0.9540), and 0.8368 (95% CI: 0.7346 -0.9390), respectively, with no statistical significant differences (x 2 -test; P ¼ 0.8440). Conclusions: A moderate intraobserver agreement was observed in the classification of periodontal bone defects and the 100%, 200% and 400% zoomed digital images presented similar performances in the detection of periodontal bone defects.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 95%

Accuracy of zoomed digital image in the detection of periodontal bone defect:in vitrostudy

Morais

Sakakura²,

Loffredo³

et al. 2006

Dentomaxillofacial Radiology

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“…Besides, the use of magnification on the digital images has not been justified. Previous studies have shown that diagnostic information will often be lost with magnification of digital images [Møystad, 1995]. Magnification may have been employed to avoid introducing a bias between the evaluated imaging modalities, both analog and digital, yet it was not uniform (E2 vs. E6).…”

Section: Discussionmentioning

confidence: 99%

An in–vitro Evaluation of Kodak Insight and Ektaspeed Plus Film with a CMOS Detector for Natural Proximal Caries: ROC Analysis

Nair

Nair²

2001

Caries Res

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This study compared the diagnostic efficacy of Kodak Ektaspeed Plus film, Kodak Insight film, a newly introduced E/F–speed film, and Schick CMOS–APS digital sensor, with respect to caries detection in 92 proximal surfaces of extracted unrestored teeth, 51 of which were carious. Ground truth was evaluated histologically and the lesions classified as enamel or dentinal. Eight observers read the radiographs using a five–point confidence rating scale to record their diagnoses. Analyses using receiver operating characteristic curves revealed the areas under each curve that indicated the diagnostic accuracy (Ektaspeed Plus – 0.760, Insight – 0.778 and CMOS–APS sensor – 0.732). ANOVA revealed significant differences with respect to caries depth (p<0.031) and observers (p<0.0001). Weighted kappa analyses indicated moderate to substantial inter– and intra–observer agreement (0.42 and 0.66, respectively). The results suggest that none of the imaging modalities evaluated in this study differed in their diagnostic capabilities with respect to proximal decay detection and that the Insight film which was used with 20% less radiation exposure than Ektaspeed Plus film was as good as the other two sensors for this purpose.

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“…By further specifying the technical parameters to be applied for the monitors, variabilities that may arise from the switching of monitors were avoided [Møystad et al, 1994;Versteeg et al, 1997a]. We selected a constant image size based on previous studies, which indicated a significant difference between approximal caries diagnosis obtained from images with different magnification [Møystad et al, 1995;Svanaes et al, 1996]. Further, in the present study we used black image surroundings because we noted a difference in observer…”

Section: Discussionmentioning

confidence: 99%

Approximal Caries Depth Assessment with Storage Phosphor versus Film Radiography

2000

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Objectives: To study whether caries–specific enhancement of storage phosphor images might improve the observer performance of approximal caries depth assessments compared with film radiography. Materials and Methods: 120 exposures were made of 120 extracted human teeth. To obtain geometrically identical images, Ektaspeed Plus films and storage phosphor plates were exposed simultaneously. The imaging plates were scanned in a Digora^® scanner and the files transferred to a different platform for image enhancement. Nine observers viewed films and storage phosphor images without provisions for adjustment of image intensity and contrast. For each imaging modality, 240 approximal surfaces were rated for caries on a 5–point confidence scale. Definite and probable caries lesions were also rated for lesion depth, and all ratings were compared with the histological state. Diagnostic accuracy was expressed as the area under the ROC curve (A_z value). Paired t tests were used to compare the imaging modalities for diagnostic accuracy and F tests to compare observer variances. Results: Enhanced storage phosphor images demonstrated significantly higher mean A_z values than film (p = 0.0066). Significantly higher mean A_z values were demonstrated in the outer half of enamel (p = 0.01), but no significant differences were found between the modalities for caries lesions penetrating beyond the outer half of the enamel. The number of correctly diagnosed true–positive surfaces with caries in outer enamel was significantly higher with storage phosphor images than with film (p = 0.00014). False–positive surfaces were most frequently registered in the outer enamel with both modalities, but in this region the number of false–positive surfaces was significantly higher with storage phosphor images than with film (p = 0.0038). Pooled sensitivity and specificity values were 0.48/0.94 and 0.61/0.86 for film and storage phosphor images, respectively. The interobserver variability was significantly lower for storage phosphor images than for film. Conclusion: Enhancement of storage phosphor images with a caries–specific procedure significantly improved the accuracy of caries depth assessments in the outer half of the enamel compared with film radiography and reduced observer variability.

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Effect of image magnification of digitized bitewing radiographs on approximal caries detection: an in vitro study.

Cited by 45 publications

References 9 publications

Accuracy of zoomed digital image in the detection of periodontal bone defect:in vitrostudy

Accuracy of zoomed digital image in the detection of periodontal bone defect:in vitrostudy

An in–vitro Evaluation of Kodak Insight and Ektaspeed Plus Film with a CMOS Detector for Natural Proximal Caries: ROC Analysis

Approximal Caries Depth Assessment with Storage Phosphor versus Film Radiography

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