Reproducibility of cephalometric landmarks on posteroanterior digital radiographs using DICOM and JPEG formats

Reproducibility of cephalometric landmarks on posteroanterior digital radiographs using DICOM and JPEG formats

Author Saez, Daniel Martinez Google Scholar
Bommarito, Silvana Autor UNIFESP Google Scholar
Sannomiya, Eduardo Kazuo Autor UNIFESP Google Scholar
Abstract Objectives To evaluate the influence of DICOM and JPEG formats on the reproducibility of identification of cephalometric landmarks on posteroanterior digital radiographs. Methods The sample consisted of digital images of posteroanterior radiographs saved in DICOM format

they were subsequently converted into JPEG format with quality factors of 100, 80, and 60. After sample blinding, 18 cephalometric points were identified on each image by three calibrated orthodontists using a system of x- and y-axis Cartesian coordinates. The intraclass correlation test was applied to analyze the occurrence of systematic errors, and Dahlberg's formula was used to calculate casual errors. The reproducibility between the DICOM and JPEG formats was compared by analysis of variance. All tests were conducted with a significance level of 5 %. Results Each examiner repeated the procedure 30 days after the initial test with 20 % of the images, which were randomly selected, in each file format. We found that the cephalometric landmarks in the posteroanterior digital radiographs presented intraexaminer and interexaminer reproducibility

the exceptions were points ZL, ZR, AZ, JR, NC, and CN in the y-axis and A6 in the x-axis, which were due to intraclass correlations under 0.90 and casual error over 1.0 mm, irrespective of file format (DICOM or JPEG). Conclusions The DICOM and JPEG file formats and quality factors of 100, 80, and 60 did not affect the intraexaminer and interexaminer reproducibility of cephalometric landmarks.
Keywords Cephalometrics
Radiographic image enhancement
Dental radiography
xmlui.dri2xhtml.METS-1.0.item-coverage New York
Language English
Date 2016
Published in Oral Radiology. New York, v. 32, n. 2, p. 79-86, 2016.
ISSN 0911-6028 (Sherpa/Romeo, impact factor)
Publisher Springer
Extent 79-86
Origin http://dx.doi.org/10.1007/s11282-015-0217-5
Access rights Closed access
Type Article
Web of Science ID WOS:000375535700003
URI https://repositorio.unifesp.br/handle/11600/55980

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