Manipulação em imagens radiográficas odontológicas digitais e digitalizadas e a certificação digital
Carregando...
Arquivos
Data
2006-07-04
Autores
Soares, Milton Gonçalves [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo neste trabalho foi verificar a possibilidade de manipulação em imagens radiográficas digitais e digitalizadas, avaliar a capacidade dos especialistas em Radiologia Odontológica em detectá-las, avaliar o conhecimento dos mesmos sobre a certificação digital e seus aspectos legais, verificando a segurança do sistema. Para tanto, foram utilizadas 15 radiografias, dez digitalizadas e cinco digitais, sendo 12 manipuladas, nas quais foram feitas manipulações digitais simulando várias condições, por exemplo, inserção e remoção de lesões, reabsorção óssea e radicular. Para isso foi utilizado o programa gráfico Adobe Photoshop versão 7.0 (Adobe systems incorporated,USA). Após as manipulações as imagens foram apresentadas no programa PowerPoint e posteriormente avaliadas por 20 examinadores, os quais responderam questionários referentes às manipulações das imagens radiográficas e a certificação digital, a qual realizamos testes para verificar sua segurança. Os resultados obtidos com a aplicação do Teste Z, para análise estatística das avaliações das imagens e para as respostas sobre certificação digital, mostram que houve baixo percentual de acerto por parte dos examinadores nas avaliações das imagens, apresentando resultado estatístico significante ao nível de 5%. Para as respostas sobre certificação digital houve diferença estatisticamente significante para duas perguntas, isso demonstra que os profissionais não têm conhecimento suficiente para utilizar esse sistema de segurança digital. Portanto, concluímos que, é possível manipular imagens radiográficas digitais e digitalizadas sem que os especialistas em Radiologia Odontológica detectem-nas e que os mesmos têm pouco conhecimento sobre certificação digital, seus aspectos legais e sua segurança.
The aims of the present research paper are to evaluate the possibility of manipulation on digital and digitalized radiographic images, to assess the ability of Oral and Maxillofacial Radiologists to detect these manipulations, and to evaluate their knowledge about the Digital Certification, its forensic aspects and its security. From a total of 15 radiographies, 10 digitalized and 5 digital, 12 had many conditions digitally added, such as lesions, bone resorption and dental resorption. The manipulations were done on Adobe Photoshop v. 7.0 (Adobe systems incorporated, USA). The images were then inserted as PowerPoint presentations and submitted to the evaluation of 20 Oral and Maxillofacial Radiologists, who answered a questionnaire about the manipulations and the Digital Certification. This system was also tested in order to verify its security. The Z-Test was used to analyze the answers about the manipulation of the images evaluation and the answers about the Digital Certification. The results demonstrated a low percentage of right answers about the manipulation of the images. This result was statistically significant at 5% level of confidence. On the other hand, there was no statistically significant diferences for the answers about the Digital Certification, although the results showed that the professionals do not have enough knowledge to use this security system. We concluded therefore that it is possible to manipulate digital and digitalized images with enough quality to avoid the Oral and Maxillofacial Radiologists detecting the modifications. We also concluded that the professionals have little knowledge about the Digital Certification, its forensic aspects and its security.
The aims of the present research paper are to evaluate the possibility of manipulation on digital and digitalized radiographic images, to assess the ability of Oral and Maxillofacial Radiologists to detect these manipulations, and to evaluate their knowledge about the Digital Certification, its forensic aspects and its security. From a total of 15 radiographies, 10 digitalized and 5 digital, 12 had many conditions digitally added, such as lesions, bone resorption and dental resorption. The manipulations were done on Adobe Photoshop v. 7.0 (Adobe systems incorporated, USA). The images were then inserted as PowerPoint presentations and submitted to the evaluation of 20 Oral and Maxillofacial Radiologists, who answered a questionnaire about the manipulations and the Digital Certification. This system was also tested in order to verify its security. The Z-Test was used to analyze the answers about the manipulation of the images evaluation and the answers about the Digital Certification. The results demonstrated a low percentage of right answers about the manipulation of the images. This result was statistically significant at 5% level of confidence. On the other hand, there was no statistically significant diferences for the answers about the Digital Certification, although the results showed that the professionals do not have enough knowledge to use this security system. We concluded therefore that it is possible to manipulate digital and digitalized images with enough quality to avoid the Oral and Maxillofacial Radiologists detecting the modifications. We also concluded that the professionals have little knowledge about the Digital Certification, its forensic aspects and its security.
Descrição
Palavras-chave
Dentes - Radiografias, Diagnóstico por imagem, Computadores digitais - Confiabilidade, Responsabilidade legal, Radiografia dentária digital, Radiography, Image processing, Liability
Como citar
SOARES, Milton Gonçalves. Manipulação em imagens radiográficas odontológicas digitais e digitalizadas e a certificação digital. 2006. 105 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Odontologia de São José dos Campos, 2006.