Avaliação de reabsorções radiculares externas por meio de reconstrução digital de imagens e subtração radiográfica digital
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Data
2008-04-22
Autores
Ono, Evelise [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Diante dos prejuízos que a reabsorção severa da raiz pode acarretar, e considerando a técnica de subtração radiográfica digital (SDR) importante recurso para detecção precoce de alterações minerais, propõe-se neste estudo avaliar a eficiência de um programa de computador, que execute o registro das imagens e SRD, no diagnóstico da reabsorção radicular externa simulada, comparado à radiografia digital, além da concordância intra e interexaminadores nos 2 métodos de diagnóstico. Os 49 dentes de mandíbulas humanas maceradas com reabsorções de diferentes dimensões, simuladas na região apical e lingual, foram radiografados com variação de ângulos de projeção. A radiografias foram registradas a posteriori pelo programa Regeemy® e subtraídas pelo programa Image Tool®. A quantidade de ruído estrutural nas imagens subtraídas foi obtida pela mensuração da média e desvio-padrão dos níveis de cinza. Para avaliação do desempenho dos métodos de diagnóstico, pares de radiografias periapicais e imagens subtraídas foram apresentadas a 3 radiologistas. De acordo com os resultados, o ruído das imagens subtraídas de radiografias após variações de 10º e 20º do ângulo vertical e 10º horizontal e corrigidas a posteriori, foi significantemente maior que das imagens subtraídas de radiografias padrão, independente da região radiografada. Não houve diferença estatisticamente significativa entre os métodos na detecção de reabsorções apicais, independentemente do tamanho da lesão, assim como não houve diferença entre os métodos na detecção de reabsorções linguais de 1,2 mm ou mais. A SRD foi significantemente superior à radiografia digital para detecção de lesões linguais de cerca de 1 mm. Cavidades na superfície lingual de cerca de 0,5 mm não foram detectadas com precisão por nenhum dos métodos...
Because of the harm that severe root resorption may cause and considering the digital subtraction technique (DSR) as an important tool for early detection of mineral alterations, the aims on the present study are to assess the efficiency of a computer software for image registration and DSR on the diagnosis of simulated root resorption, to compare their results with those obtained with digital radiographs, and to assess the intra- and inter-examiner agreement using the two methods of diagnosis. Forty nine teeth with simulated lingual and apical root resorptions of varied extension were x-rayed with different projection angles. The radiographs were registered a posteriori with Regeemy® software and subtracted with Image Tool® software. The amount of structural noise of the subtracted images was evaluated by measuring the mean and standard-deviation of their gray levels. The performance of each method of diagnosis was assessed by submitting pairs of periapical radiographs and the subtracted images to the evaluation of three oral radiologists. According to the results, the structural noise of subtracted images from radiographs with variations of 10º and 20º of vertical angle and 10º of horizontal angle was significantly higher than the obtained from the radiographs without angular variation, independently from the anatomic region of the image. There was no statistically significant difference between the methods on the detection of apical root resorptions independently from the size of the lesion as well as no statistically significant difference was found between the methods on the detection of lingual resorptions of 1.2mm or more. DSR was significantly superior to the digital radiographs on the detection of lingual lesions of around 1mm. Lingual lesions of around 0.5mm were not precisely detected by any of the methods. The inter- and intra-examiner agreements were substantial... (Complete abstract, click electronic access below)
Because of the harm that severe root resorption may cause and considering the digital subtraction technique (DSR) as an important tool for early detection of mineral alterations, the aims on the present study are to assess the efficiency of a computer software for image registration and DSR on the diagnosis of simulated root resorption, to compare their results with those obtained with digital radiographs, and to assess the intra- and inter-examiner agreement using the two methods of diagnosis. Forty nine teeth with simulated lingual and apical root resorptions of varied extension were x-rayed with different projection angles. The radiographs were registered a posteriori with Regeemy® software and subtracted with Image Tool® software. The amount of structural noise of the subtracted images was evaluated by measuring the mean and standard-deviation of their gray levels. The performance of each method of diagnosis was assessed by submitting pairs of periapical radiographs and the subtracted images to the evaluation of three oral radiologists. According to the results, the structural noise of subtracted images from radiographs with variations of 10º and 20º of vertical angle and 10º of horizontal angle was significantly higher than the obtained from the radiographs without angular variation, independently from the anatomic region of the image. There was no statistically significant difference between the methods on the detection of apical root resorptions independently from the size of the lesion as well as no statistically significant difference was found between the methods on the detection of lingual resorptions of 1.2mm or more. DSR was significantly superior to the digital radiographs on the detection of lingual lesions of around 1mm. Lingual lesions of around 0.5mm were not precisely detected by any of the methods. The inter- and intra-examiner agreements were substantial... (Complete abstract, click electronic access below)
Descrição
Palavras-chave
Reabsorção da raiz - dentes, Radiografia, Radiografia digital, Diagnostico precoce
Como citar
ONO, Evelise. Avaliação de reabsorções radiculares externas por meio de reconstrução digital de imagens e subtração radiográfica digital. 2008. 116 f. Tese (doutorado) - Universidade Estadual Paulista,Faculdade de Odontologia de São José dos Campos, 2008.