Effects of Image Compression on Linear Measurements of Digital Panoramic Radiographs
| Autor: | Izabel Regina Fischer Rubira-Bullen, Ana Paula Souza Lacerda, Leonardo Provedel, Viviane Almeida Sarmento, Bruna Natália Alves da Silva Pimentel, Tarcísio Martins de Jesus |
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| Rok vydání: | 2016 |
| Předmět: |
Correlation coefficient
Radiography BMP file format 030218 nuclear medicine & medical imaging 03 medical and health sciences Digital image 0302 clinical medicine digital image Radiography Panoramic General Dentistry Mathematics business.industry 030206 dentistry computer.file_format Radiography Dental Digital Data Compression JPEG image compression RADIOGRAFIA PANORÂMICA panoramic radiography Calipers Charge-coupled device business computer Image compression Biomedical engineering |
| Zdroj: | Brazilian Dental Journal, Volume: 27, Issue: 6, Pages: 757-760, Published: DEC 2016 Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Brazilian Dental Journal v.27 n.6 2016 Brazilian Dental Journal Fundação Odontológica de Ribeirão Preto (FUNORP) instacron:FUNORP |
| ISSN: | 1806-4760 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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