Effect of ambient light and monitor brightness and contrast settings on the detection of approximal caries in digital radiographs: an in vitro study.

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Effect of ambient light and monitor brightness and contrast settings on the detection of approximal caries in digital radiographs: an in vitro study.

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dc.contributor.author Hellén-Halme, Kristina
dc.contributor.author Petersson, Arne
dc.contributor.author Warfvinge, Gunnar
dc.contributor.author Nilsson, Mats
dc.date.accessioned 2008-11-17T15:00:23Z
dc.date.available 2008-11-17T15:00:23Z
dc.date.issued 2008
dc.identifier.issn 0250-832X
dc.identifier.uri http://hdl.handle.net/2043/6769
dc.description.abstract Objectives: The aim of this study was to investigate how brightness and contrast settings of the display monitor and ambient light level (illuminance) in the viewing room affect the clinician's ability to diagnose carious lesions in digital radiographs. Methods: Standardized radiographs were taken of 100 extracted teeth. Seven observers evaluated the images for approximal carious lesions twice, once under 50 lux and once under 1000 lux room illumination. Monitor brightness and contrast were varied ±50% and ±6%, respectively, to mimic the normal limits of monitor adjustment by an inexperienced user and one optimal setting. This was done by adjusting radiograph brightness and contrast by ±25%. Thus, five radiographs of each tooth were evaluated. Receiver operating characteristic (ROC) analyses were performed. Histological examinations of the teeth served as the criterion standard. A paired t-test was used to evaluate whether differences in the areas under the ROC curves were significant and kappa was used to evaluate intraobserver agreement. Results: When a monitor with optimal brightness and contrast settings was used to detect approximal carious lesions, ambient light levels less than 50 lux were significantly better than levels above 1000 lux (dentin and enamel lesions, P < 0.01; dentin lesions, P < 0.02). Increasing the contrast setting of the monitor by 6% did not change these results; 50 lux was still significantly better than 1000 lux (enamel lesions, P < 0.01; dentin and enamel lesions, P < 0.02) for evaluating radiographs. Intraobserver agreement differed from fair to good. Conclusions: Reducing ambient light to less than 50 lux significantly increased the accuracy of diagnosing approximal carious lesions on a monitor with an optimal brightness setting and an optimal or slightly higher than optimal contrast setting. en
dc.format.extent 5
dc.language.iso eng en
dc.subject.classification Medicine en
dc.title Effect of ambient light and monitor brightness and contrast settings on the detection of approximal caries in digital radiographs: an in vitro study. en
dc.type Article, peer reviewed scientific en
dc.contributor.department Malmö University. Faculty of Odontology en
dc.identifier.doi 10.1259/dmfr/26038913
dc.subject.srsc Research Subject Categories::ODONTOLOGY en
dc.relation.ispartofpublication Dento-maxillo-facial radiology;7 en
dc.relation.ispartofpublicationvolume 37 en
dc.format.ePage 384
dc.format.sPage 380
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