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Analysis of the reproducibility of the gray values and noise of a direct digital radiography system
POLETI, Marcelo Lupion; FERNANDES, Thais Maria Freire; TEIXEIRA, Renata Cordeiro; CAPELOZZA, Ana Lúcia Alvares; RUBIRA-BULLEN, Izabel Regina Fischer.
Afiliación
  • POLETI, Marcelo Lupion; Universidade Norte do Paraná. Faculty of Dentistry. Department of Orthodontics. Londrina. BR
  • FERNANDES, Thais Maria Freire; Universidade Norte do Paraná. Faculty of Dentistry. Department of Orthodontics. Londrina. BR
  • TEIXEIRA, Renata Cordeiro; Universidade Norte do Paraná. Faculty of Dentistry. Department of Orthodontics. Londrina. BR
  • CAPELOZZA, Ana Lúcia Alvares; Universidade Norte do Paraná. Faculty of Dentistry. Department of Orthodontics. Londrina. BR
  • RUBIRA-BULLEN, Izabel Regina Fischer; Universidade Norte do Paraná. Faculty of Dentistry. Department of Orthodontics. Londrina. BR
Braz. oral res. (Online) ; 29(1): 1-5, 2015. tab, ilus
Article en En | LILACS | ID: lil-777262
Biblioteca responsable: BR1.1
ABSTRACT
The aim of this study was to evaluate the reproducibility of the gray values and noise of a direct digital radiography system (Visualix eHD) for various exposure times and analyzed regions. To obtain radiographic images in a standardized manner, the digital sensor of the system and a stepwedge were positioned in a phantom at a focus-film distance of 30 cm in a dental device at 70 kV, 7 mA and 2.2 mm filtration. Ten consecutive repetitions of X-ray imaging were performed at each exposure time (0.05, 0.07, 0.09 and 0.13 s). Gray values were analyzed using ImageJ software in five regions of interest (ROIs) alveolar bone (AB), soft tissue (ST) and three steps of the stepwedge (S1, S2 and S3). The results showed that both the variability of the gray values and the noise were statistically greater (p < 0.05) in the most radiolucent region (ST). Only the noise was affected by the exposure time. In conclusion, the reproducibility of the gray values and the noise of the Visualix eHD system can vary in specific areas with different radiolucency.
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Texto completo: 1 Colección: 01-internacional Base de datos: LILACS Asunto principal: Procesamiento de Imagen Asistido por Computador / Radiografía Dental Digital Tipo de estudio: Evaluation_studies Límite: Humans Idioma: En Revista: Braz. oral res. (Online) Asunto de la revista: ODONTOLOGIA Año: 2015 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Brasil

Texto completo: 1 Colección: 01-internacional Base de datos: LILACS Asunto principal: Procesamiento de Imagen Asistido por Computador / Radiografía Dental Digital Tipo de estudio: Evaluation_studies Límite: Humans Idioma: En Revista: Braz. oral res. (Online) Asunto de la revista: ODONTOLOGIA Año: 2015 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Brasil