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Effects of Image Compression on Linear Measurements of Digital Panoramic Radiographs

Overview of attention for article published in Brazilian Dental Journal, December 2016
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Title
Effects of Image Compression on Linear Measurements of Digital Panoramic Radiographs
Published in
Brazilian Dental Journal, December 2016
DOI 10.1590/0103-6440201601157
Pubmed ID
Authors

Provedel, Leonardo Francisco, Pimentel, Bruna Natália Alves da Silva, Jesus, Tarcísio Martins de, Lacerda, Ana Paula Souza, Rubira-Bullen, Izabel Regina Fischer, Sarmento, Viviane Almeida, Provedel, Leonardo Francisco, Pimentel, Bruna Natália Alves da Silva, Jesus, Tarcísio Martins de, Lacerda, Ana Paula Souza, Rubira-Bullen, Izabel Regina Fischer, Sarmento, Viviane Almeida

Abstract

This study aimed to evaluate the accuracy of panoramic radiographs obtained by digital system based on charge coupled device (CCD) and a phosphor storage plate (PSP) system with two different file formats, JPEG irreversible type and BMP. Linear measurements of artificial bony defects were made in dry mandibles with a digital caliper. Measures of digital panoramic radiographs were taken in ImageJ(r) software. Each measurement was performed twice by an experienced examiner. The intra-rater agreement was considered very strong (Pearson's correlation coefficient of 0.97). There was no significant difference between the linear measurements of dry mandibles, considered the gold standard, in relation to measurements obtained from digital radiographs (p=0.47). The error of these measures for the CCD was 1.04 mm (9.97%) for JPEG images and 1.03 mm (9.99%) for those with BMP format. For the PSP images, these values were 1.48 mm (14.94%) and 1.43 mm (14.43%), respectively. Although there was no statistical difference between the images with JPEG and BMP format, for both digital systems (p=1.00 for CCD and p=0.98 for PSP system), errors made on radiographs obtained by PSP system were significantly higher than those of CCD (p<0.05). The size of the files saved in JPEG was also significantly lower (p=0.005) compared with the files saved in BMP. It may be concluded that the digital radiographs, both saved in JPEG and BMP formats, are accurate, regardless the used digital system, and JPEG images are more suitable for teleradiology.

Mendeley readers

The data shown below were compiled from readership statistics for 7 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 7 100%

Demographic breakdown

Readers by professional status Count As %
Professor 1 14%
Professor > Associate Professor 1 14%
Student > Bachelor 1 14%
Student > Postgraduate 1 14%
Unknown 3 43%
Readers by discipline Count As %
Medicine and Dentistry 4 57%
Unknown 3 43%