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The effects of noise reduction, sharpening, enhancement, and image magnification on diagnostic accuracy of a photostimulable phosphor system in the detection of non-cavitated approximal dental caries.

Kajan ZD, Tayefeh Davalloo R, Tavangar M, Valizade F - Imaging Sci Dent (2015)

Bottom Line: The diagnostic accuracy of the observers was compared using a chi-squared test.The accuracy levels irrespective of the image processing method ranged from weak (18.8%) to intermediate (54.2%), but the highest accuracy was achieved at the sixth image processing step.The overall diagnostic accuracy level showed a statistically significant difference (p=0.0001).

View Article: PubMed Central - PubMed

Affiliation: Department of Maxillofacial Radiology, Faculty of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.

ABSTRACT

Purpose: Contrast, sharpness, enhancement, and density can be changed in digital systems. The important question is to what extent the changes in these variables affect the accuracy of caries detection.

Materials and methods: Forty eight extracted human posterior teeth with healthy or proximal caries surfaces were imaged using a photostimulable phosphor (PSP) sensor. All original images were processed using a six-step method: (1) applying "Sharpening 2" and "Noise Reduction" processing options to the original images; (2) applying the "Magnification 1:3" option to the image obtained in the first step; (3) enhancing the original images by using the "Diagonal/" option; (4) reviewing the changes brought about by the third step of image processing and then, applying "Magnification 1:3"; (5) applying "Sharpening UM" to the original images; and (6) analyzing the changes brought about by the fifth step of image processing, and finally, applying "Magnification 1:3." Three observers evaluated the images. The tooth sections were evaluated histologically as the gold standard. The diagnostic accuracy of the observers was compared using a chi-squared test.

Results: The accuracy levels irrespective of the image processing method ranged from weak (18.8%) to intermediate (54.2%), but the highest accuracy was achieved at the sixth image processing step. The overall diagnostic accuracy level showed a statistically significant difference (p=0.0001).

Conclusion: This study shows that the application of "Sharpening UM" along with the "Magnification 1:3" processing option improved the diagnostic accuracy and the observer agreement more effectively than the other processing procedures.

No MeSH data available.


Related in: MedlinePlus

Selection of the "Sharpening 2" option.
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Figure 4: Selection of the "Sharpening 2" option.

Mentions: It should be noted that "Sharpening 2," "Noise Reduction," "Diagonal/," and "Sharpening UM" are processing functions in the Scanora 0.8 software. For example, "Sharpening" induces the sharpening of the original image and has values ranging from 1 to 4 with the highest value designated as "Sharpening UM" (Fig. 4).


The effects of noise reduction, sharpening, enhancement, and image magnification on diagnostic accuracy of a photostimulable phosphor system in the detection of non-cavitated approximal dental caries.

Kajan ZD, Tayefeh Davalloo R, Tavangar M, Valizade F - Imaging Sci Dent (2015)

Selection of the "Sharpening 2" option.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4483624&req=5

Figure 4: Selection of the "Sharpening 2" option.
Mentions: It should be noted that "Sharpening 2," "Noise Reduction," "Diagonal/," and "Sharpening UM" are processing functions in the Scanora 0.8 software. For example, "Sharpening" induces the sharpening of the original image and has values ranging from 1 to 4 with the highest value designated as "Sharpening UM" (Fig. 4).

Bottom Line: The diagnostic accuracy of the observers was compared using a chi-squared test.The accuracy levels irrespective of the image processing method ranged from weak (18.8%) to intermediate (54.2%), but the highest accuracy was achieved at the sixth image processing step.The overall diagnostic accuracy level showed a statistically significant difference (p=0.0001).

View Article: PubMed Central - PubMed

Affiliation: Department of Maxillofacial Radiology, Faculty of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.

ABSTRACT

Purpose: Contrast, sharpness, enhancement, and density can be changed in digital systems. The important question is to what extent the changes in these variables affect the accuracy of caries detection.

Materials and methods: Forty eight extracted human posterior teeth with healthy or proximal caries surfaces were imaged using a photostimulable phosphor (PSP) sensor. All original images were processed using a six-step method: (1) applying "Sharpening 2" and "Noise Reduction" processing options to the original images; (2) applying the "Magnification 1:3" option to the image obtained in the first step; (3) enhancing the original images by using the "Diagonal/" option; (4) reviewing the changes brought about by the third step of image processing and then, applying "Magnification 1:3"; (5) applying "Sharpening UM" to the original images; and (6) analyzing the changes brought about by the fifth step of image processing, and finally, applying "Magnification 1:3." Three observers evaluated the images. The tooth sections were evaluated histologically as the gold standard. The diagnostic accuracy of the observers was compared using a chi-squared test.

Results: The accuracy levels irrespective of the image processing method ranged from weak (18.8%) to intermediate (54.2%), but the highest accuracy was achieved at the sixth image processing step. The overall diagnostic accuracy level showed a statistically significant difference (p=0.0001).

Conclusion: This study shows that the application of "Sharpening UM" along with the "Magnification 1:3" processing option improved the diagnostic accuracy and the observer agreement more effectively than the other processing procedures.

No MeSH data available.


Related in: MedlinePlus