Image quality in partially erased DenOptix® storage phosphor plates

Lopes, Sérgio Lúcio Pereira de Castro; Cruz, Adriana Dibo da; Ferreira, Rívea Inês; Bóscolo, Frab Norberto; Almeida, Solange María de

doi:10.1590/s1806-83242008000100014

Cited by 11 publications

(8 citation statements)

References 10 publications

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“…The results in this study differ from Lopes et al, 21 probably because in their study the observers were told to choose one of the paired images based on no specific criteria. Also, the object was an acrylic phantom fixed on the positioning apparatus to acquire a geometric pattern.…”

Section: Discussioncontrasting

confidence: 94%

“…The presence of image noise on partially erased phosphor plates should be considered when enhancement of the image is needed. Versteeg et al 21 noted that digital image density can be increased until it is adequate for diagnosis, but the enhanced digital image will show an increase in noise. Therefore, a higher amount of noise may be generated during digital enhancement if the digital image already has increased noise due to a suboptimal erasing time which will interfere with the final image quality.…”

Section: Discussionmentioning

confidence: 99%

“…According to Lopes et al, 21 under adequate and controlled viewing box luminosity, the DenOptixH PSPs can be erased in 5 s, since incomplete erasing did not cause significant loss of diagnostic image quality in simulated clinical settings. The results in this study differ from Lopes et al, 21 probably because in their study the observers were told to choose one of the paired images based on no specific criteria.…”

Section: Discussionmentioning

confidence: 99%

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Effect of alternative photostimulable phosphor plates erasing times on subjective digital image quality

Melo

Pontual²,

Almeida³

et al. 2010

Dentomaxillofacial Radiology

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Objective: To evaluate the influence of alternative erasing times of DenOptixH (Dentsply/ Gendex, Chicargo, IL) digital plates on subjective image quality and the probability of double exposure image not occurring. Methods: Human teeth were X-rayed with phosphor plates using ten different erasing times. Two observers evaluated the images for subjective image quality (sharpness, brightness, contrast, enamel definition, dentin definition and dentin-enamel junction definition) and for the presence or absence of double exposure image. Spearman's correlation analysis and ANOVA was performed to verify the existence of a linear association between the subjective image quality parameters and the alternative erasing times. A contingency table was constructed to evaluate the agreement among the observers, and a binominal logistic regression was performed to verify the correlation between the erasing time and the probability of double exposure image not occurring. Results: All 6 parameters of image quality were rated high by the examiners for the erasing times between 25 s and 130 s. The same erasing time range, from 25 to 130 s, was considered a safe erasing time interval, with no probability of a double exposure image occurring. Conclusions: The alternative erasing times from 25 s to 130 s showed high image quality and no probability of double image occurrence. Thus, it is possible to reduce the operating time of the DenOptixH digital system without jeopardizing the diagnostic task.

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Section: Discussioncontrasting

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Effect of alternative photostimulable phosphor plates erasing times on subjective digital image quality

Melo

Pontual²,

Almeida³

et al. 2010

Dentomaxillofacial Radiology

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“…This would reduce the number of procedures performed based on false-positive diagnoses, therefore reducing service costs. Thus, the relatively higher cost of the digital systems in comparison with conventional radiography18 can be expected to be made up for by the cost-effectiveness of the digital system.…”

Section: Discussionmentioning

confidence: 99%

Radiopacity of restorative composites by conventional radiograph and digital images with different resolutions

et al. 2013

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PurposeThis study was performed to evaluate and compare the radiopacity of dentin, enamel, and 8 restorative composites on conventional radiograph and digital images with different resolutions.Materials and MethodsSpecimens were fabricated from 8 materials and human molars were longitudinally sectioned 1.0 mm thick to include both enamel and dentin. The specimens and tooth sections were imaged by conventional radiograph using #4 sized intraoral film and digital images were taken in high speed and high resolution modes using a phosphor storage plate. Densitometric evaluation of the enamel, dentin, restorative materials, a lead sheet, and an aluminum step wedge was performed on the radiographic images. For the evaluation, the Al equivalent (mm) for each material was calculated. The data were analyzed using one-way ANOVA and Tukey's test (p<0.05), considering the material factor and then the radiographic method factor, individually.ResultsThe high speed mode allowed the highest radiopacity, while the high resolution mode generated the lowest values. Furthermore, the high resolution mode was the most efficient method for radiographic differentiation between restorative composites and dentin. The conventional radiograph was the most effective in enabling differentiation between enamel and composites. The high speed mode was the least effective in enabling radiographic differentiation between the dental tissues and restorative composites.ConclusionThe high speed mode of digital imaging was not effective for differentiation between enamel and composites. This made it less effective than the high resolution mode and conventional radiographs. All of the composites evaluated showed radiopacity values that fit the ISO 4049 recommendations.

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“…12,18,19 After evaluating the effect of different erasing times on proximal caries diagnosis, Melo et al 12 reported no significant difference in both pixel intensity values and diagnostic accuracy of observers. Since the effect of various erasing times was tested, the methods of the former and the presented study were basically not the same; therefore, the comparison of the results may not be relevant.…”

Section: Discussionmentioning

confidence: 99%

The effect of delayed scanning of storage phosphor plates on occlusal caries detection

Soğur¹,

Baksı²,

Mert³

2012

Dentomaxillofacial Radiology

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Objective: The aim of this study was to determine (1) the effect of various scan delays on pixel intensity measurements and (2) the diagnostic accuracy of occlusal caries detection. Methods: 72 non-cavitated extracted human permanent molar teeth with sound and carious occlusal surfaces were radiographed using the DIGORAH storage phosphor plates (SPPs) (Soredex Corporation, Helsinki, Finland). Plates were scanned immediately and 10 min, 30 min, 60 min and 120 min after exposure. Three different plates were used for each scan delay. An aluminium (Al) wedge was used to evaluate the change in mean grey values (MGVs) for scan delays. Diagnostic accuracy for occlusal caries detection was performed by scoring all the digital images. The true presence of caries was determined by stereomicroscopy. Comparison of MGVs of the Al wedge for immediate and delayed scans was made using repeated measures analysis of variance (ANOVA) and Tukey-Kramer tests. The accuracy was expressed as the area under the receiver operating characteristics curves (A z ). A z s were compared using two-way ANOVA and t-tests. Kappa was used to measure inter and intraobserver agreement. Results: The mean A z s of immediately scanned plates were higher than the A z s of plates scanned with four different delays (p , 0.05). The A z of immediately scanned images was significantly higher than the A z s of images with 60 min and 120 min scan delays (p , 0.05) but not for 10 min and 30 min delays (p . 0.05). MGVs of immediately scanned plates were significantly higher than the plates scanned with four different delays (p , 0.05). Agreement decreased with increasing scan delays. Conclusion: Scanning of DIGORA SPPs should not be delayed beyond 30 min for accurate occlusal caries diagnosis.

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Image quality in partially erased DenOptix® storage phosphor plates

Cited by 11 publications

References 10 publications

Effect of alternative photostimulable phosphor plates erasing times on subjective digital image quality

Effect of alternative photostimulable phosphor plates erasing times on subjective digital image quality

Radiopacity of restorative composites by conventional radiograph and digital images with different resolutions

The effect of delayed scanning of storage phosphor plates on occlusal caries detection

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