Analysis of the reproducibility of the gray values and noise of a direct digital radiography system
AUTOR(ES)
POLETI, Marcelo Lupion, FERNANDES, Thais Maria Freire, TEIXEIRA, Renata Cordeiro, CAPELOZZA, Ana Lúcia Alvares, RUBIRA-BULLEN, Izabel Regina Fischer
FONTE
Braz. oral res.
DATA DE PUBLICAÇÃO
26/05/2015
RESUMO
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.
Documentos Relacionados
- Evaluation of the compression of the Cephalometric Radiography digital images in the reproducibility of cephalometric Landmarks.
- Comparison of the Accuracy of Digital Radiography with Conventional Radiography and Visual Examination in the Detection of Permanent Teeth Interproximal Caries
- Construction of a copper stepwedge with aluminum equivalent mean gray values
- Nonlinear systems analysis: comparison of white noise and sum of sinusoids in a biological system.
- The Effect of Digital Noise Reduction on Annoyance and Speech Perception in Low and High Acceptable Noise Level Groups