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Digitizing radiographic films: a simple way to evaluate indirect digital images

By Izabel Regina Fischer Rubia-Bullen, Maurício Cunha Escarpinati, Homero Schiabel, Marcelo Andrade da Costa Vieira, Cássia Maria Fischer Rubira and José Roberto Pereira Lauris

Abstract

OBJECTIVES: This study applied a simple method to evaluate the performance of three digital devices (two scanners and one digital camera) using the reproducibility of pixel values attributed to the same radiographic image. METHODS: Using the same capture parameters, a radiographic image was repeatedly digitized in order to determine the variability of pixel values given to the image throughout the digitization process. One coefficient value was obtained and was called pixel value reproducibility. RESULTS: A significant difference in pixel values was observed among the three devices for the digitized images (ANOVA, p<0.00001). There was significant pixel value variability at the same digitization conditions for one scanner and the digital camera. CONCLUSIONS: Digital devices may assign pixel values differently in consecutive digitization depending on the optical density of the radiographic image and the equipment. The pixel value reproducibility was not satisfactory as tested for two devices. It is maybe advisable knowing the digitization variations regarding pixel values whenever using digital radiography images in longitudinal clinical examinations

Topics: Digital image, Radiographic image, Charge-coupled device, Digital camera, Scanner, Dentistry, RK1-715, Medicine, R, DOAJ:Dentistry, DOAJ:Health Sciences
Publisher: University of São Paulo
Year: 2007
DOI identifier: 10.1590/S1678-77572007000100004
OAI identifier: oai:doaj.org/article:11d88a2caa0f488b8c298219df00d6a3
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