Analise de imagens obtidas por placas de fosforo digitais submetidas a diferentes tempos e condições de armazenamento

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

The high cost of the digital systems of phosphor storage plates can be compensated by the fact of only one scanner to be divided by some professionals. However, this can bring as consequence, the necessity of the storage of these plates for a determined period of time, for posterior scanning. Being unware of the implacatios of this storage in the final image, it was assessed, both objectively and subjectively, the effects on digital images captured using Digora and DenOptix s phosphor storage plates subjected to different storage conditions and varying delays in reading. For the acomplishment of the analysis, standardised images were obtained of test objects consisting of an aluminium step wedge and dry mandible. 12 plates were exposed and immediately scanned to produce the baseline gold standard. The plates were re-exposed, stored under three different conditions - ambient temperature, low humidity and refrigeration and then scanned after 6, 12,18,24,48 or 72 hours after initial exposure. The objective analysis was carried out by pixel density measurements and the data analysed statistically using Tukey and Dunnet tests. The subjective analysis was carried by 3 radiologists and their results subjected to Mann Whitney test. For the DenOptix system there were no differences either objectively or subjectively in all the obtained images. For the Digora, objective analysis showed loss of pixel density after 6 hours in all the different storage conditions. Subjectively this loss of density was also evident after 6 hours on plates stored in the refrigerator conditions, but only after 24 hours for plates stored under the other conditions

ASSUNTO(S)

sistemas digitais dentes - radiografia

ACESSO AO ARTIGO

Documentos Relacionados