Effect of bit depth and kVp of digital radiography for detection of subtle differences

Heo, Min-Suk; Choi, Da Hye; Benavides, Erika; Huh, Kyung-Hoe; Yi, Won-Jin; Lee, Sam Sun; Choi, Sumin

doi:10.1016/j.tripleo.2008.12.053

Cited by 19 publications

(7 citation statements)

References 28 publications

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“…Technically, a greater bit depth allows a better representation of structures with discrete differences in their composition and physical aspects. Heo et al [ 19 ] found that 12-bit images were superior to 8-bit images in the detection of subtle radiographic contrast, corroborating our findings. On the other hand, Wenzel et al [ 20 ] showed that the detection of small caries lesions was not different between 8-, 12-, and 16-bit images.…”

Section: Discussionsupporting

confidence: 90%

Digital file format does not influence the radiographic diagnosis of vertical root fracture

et al. 2021

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Objective To evaluate the influence of the file format of digital periapical radiographs on the diagnosis of vertical root fracture (VRF). Study design Periapical radiographic images of 34 single-rooted teeth—19 with VRF, and 15 without VRF were acquired using two digital systems—Digora Toto, and Digora Optime, and exported into four different file formats—TIFF, BMP, PNG, and JPEG, totaling 272 radiographs. The radiographs were assessed by five examiners for the detection of VRF, using a 5-point scale (1—definitely absent; 2—probably absent; 3—uncertain; 4—probably present; 5—definitely present). Diagnostic values of area under the ROC curve, specificity, and sensitivity for the diagnosis of VRF were calculated. The results were compared by two-way Analysis of Variance with post hoc Tukey’s test. The intra- and inter-examiner agreements were measured by the Kappa test. The significance level was set at 5% for all analyses. Results The values of intra-examiner agreement varied from moderate (0.56) to almost perfect (0.81), while the values of inter-examiner agreement varied from fair (0.29) to moderate (0.60). The image file format did not influence the diagnostic values for VRF for any of the radiographic systems tested ( p > 0.05). Digora Toto had significantly greater values of area under the ROC curve than Digora Optime for all file formats ( p = 0.001). Conclusion The image file format of periapical radiographs does not influence the diagnosis of VRF, regardless of the digital radiography system.

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Section: Discussionsupporting

confidence: 90%

Digital file format does not influence the radiographic diagnosis of vertical root fracture

et al. 2021

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“…The phantom used in the study was an aluminum step wedge and a plate. Although there are numerous reports of experiments conducted to assess detectors using an aluminum step wedge, its accuracy has been little considered, and a step wedge in steps of 1 mm thickness is generally used [ 16 ]. Because a thickness increase in 0.5 mm increments with aluminum steps was used in the study, it revealed new findings.…”

Section: Discussionmentioning

confidence: 99%

“…That is, automatic adjustments of the density and contrast are included to delete noise that is irrelevant to an object. Concerning image bit depth, previous studies reported that higher image bit depth was superior to lower image bit depth [ 16 , 19 ]. These early digital imaging instruments did not have the AEC function.…”

Section: Discussionmentioning

confidence: 99%

Numerical Evaluation of Image Contrast for Thicker and Thinner Objects among Current Intraoral Digital Imaging Systems

Dashpuntsag

Yoshida

Kasai

et al. 2017

BioMed Research International

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The purpose is to evaluate the performance of current intraoral digital detectors in detail using a precise phantom and new method. Two aluminum step wedges in 0.5 mm steps were exposed by two photostimulable phosphor plate (PSP) systems—one with automatic exposure compensation (AEC) and the other without AEC—and a CCD sensor. Images were obtained with 3 doses at 60 kV. The effect of metallic material also was evaluated. The contrast-to-noise ratio (CNR) for thinner steps and the low contrast value (LCV) for thicker steps were obtained. The CCD system was the best under all conditions (P < 0.001), although the Gray value was sensitive to the dose, and the Gray value-dose relation varied greatly. The PSP system with AEC was superior to that without AEC for the LCV (P < 0.001) but was inferior to it regarding the CNR (P < 0.001). CNR and LCV in the PSP system without AEC were not affected by the metallic plate. Intraoral digital imaging systems should be chosen according to their diagnostic purpose. PSP system with AEC may be the best for detecting molar proximal caries, whereas the PSP system without AEC may be better for evaluating small bone regeneration in periodontal disease. The CCD system provided the best performance.

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“…Although minimum radiopacity requirements were well documented, maximum limits have not been clarified considering some commercially available filling materials with extreme radiopacity (e.g., as high as the equivalent of 11 mm of aluminum). Such a high radiopacity may outperform the range of measurement of digital radiographs of limited latitude with 256 scales with consequent difficulty in interpretation of radiographs 17. It seems that ADA/ANSI/ISO4049 recommendations have missed the attention to dictate the standards of light curing.…”

Section: Discussionmentioning

confidence: 99%

How does duration of curing affect the radiopacity of dental materials?

Mir

Mir²

2012

Imaging Sci Dent

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PurposeClinicians commonly encounter cases in which it is difficult to determine whether adjacent radiopacities are normal or pathologic. The ideal radiopacity of composite resin is equal to or higher than that of the same thickness of aluminum. We aimed to investigate the possible effects of different curing times on the post-24-hour radiopacity of composite resins on digital radiographs.Materials and MethodsOne mm thick samples of Filtek P60 and Clearfil resin composites were prepared and cured with three regimens of continuous 400 mW/cm2 irradiance for 10, 20 and 30 seconds. Along with a 12-step aluminum step wedge, digital radiographs were captured and the radiopacities were transformed to the equivalent aluminum thicknesses. Data were compared by a general linear model and repeated-measures of ANOVA.ResultsOverall, the calculated equivalent aluminum thicknesses of composite resins were increased significantly by doubling and tripling the curing times (F(2,8)=8.94, p=0.002). Notably, Bonferroni post-hoc tests confirmed that the radiopacity of the cured Filtek P60 was significantly higher at 30 seconds compared with 10 seconds (p=0.04). Although the higher radiopacity was observed by increasing the time, other comparisons showed no statistical significance (p>0.05).ConclusionThese results supported the hypothesis that the radiopacity of resin composites might be related to the duration of light curing. In addition to the current standards for radiopacity of digital images, defining a standard protocol for curing of dental materials should be considered, and it is suggested that they should be added to the current requirements for dental material.

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Effect of bit depth and kVp of digital radiography for detection of subtle differences

Cited by 19 publications

References 28 publications

Digital file format does not influence the radiographic diagnosis of vertical root fracture

Digital file format does not influence the radiographic diagnosis of vertical root fracture

Numerical Evaluation of Image Contrast for Thicker and Thinner Objects among Current Intraoral Digital Imaging Systems

How does duration of curing affect the radiopacity of dental materials?

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