Open AccessEffects of Image Compression on Linear Measurements of Digital Panoramic Radiographs
Author(s) -
Leonardo Francisco Provedel,
Brutália Alves da Silva Pimentel,
Tarcísio Martins de Jesus,
Ana Paula Souza Lacerda,
Izabel Régina Fischer Rubira-Bullen,
Viviane Almeida Sarmento
Publication year - 2016
Publication title -
brazilian dental journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.616
H-Index - 50
eISSN - 1806-4760
pISSN - 0103-6440
DOI - 10.1590/0103-6440201601157
Subject(s) - radiography , compression (physics) , computer vision , digital radiography , artificial intelligence , computer graphics (images) , digital imaging , computer science , orthodontics , mathematics , digital image , image (mathematics) , medicine , materials science , image processing , radiology , composite material
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.