Análise da curva contraste detalhe para dois sistemas mamográficos com grades distintas
Authors: Souza dos Santos Lívia Raine , Batista Wilson Otto 
Published: November 2017

<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG /> </o:OfficeDocumentSettings> </xml><![endif]--> <p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify;"><strong><span style="font-size: 8.0pt; font-family: ";Calibri-Bold";,";sans-serif";; mso-bidi-font-family: Calibri-Bold;">Introdução</span></strong><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri;">: A eficiência da mamografia no diagnóstico e rastreamento do câncer de mama está diretamente relacionada a um controle de qualidade eficaz que garanta uma boa qualidade da imagem, empregando menor dose possível para o paciente. A análise da curva contraste-detalhe, sugerido como principal teste para avaliação da qualidade de imagem pelo protocolo europeu é um método conceitual, visual e quantitativo que relaciona a resolução de contraste e a resolução espacial na imagem digital. </span><strong><span style="font-size: 8.0pt; font-family: ";Calibri-Bold";,";sans-serif";; mso-bidi-font-family: Calibri-Bold;">Objetivo</span></strong><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri;">: Avaliar a qualidade da imagem, a partir da análise da curva contraste detalhe, em um sistema de radiografia CR, instalado em dois equipamentos de mamografia que utilizam diferentes tipos de grades antidifusoras. </span><strong><span style="font-size: 8.0pt; font-family: ";Calibri-Bold";,";sans-serif";; mso-bidi-font-family: Calibri-Bold;">Materiais e Métodos</span></strong><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri;">: Foram avaliados os equipamentos da Siemens Mammomat 3000 NOVA e Hologic LORAD M-IV, os quais possuem diferentes tipos de grades. Foi utilizado o simulador </span><em><span style="font-size: 8.0pt; font-family: Calibri-Italic; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri-Italic;">CDMAM </span></em><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri;">para obtenção das curvas contraste-detalhe e placas de </span><em><span style="font-size: 8.0pt; font-family: Calibri-Italic; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri-Italic;">PMMA </span></em><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri;">para simular diferentes espessuras mamárias. Os valores da Razão Contraste Ruído (</span><em><span style="font-size: 8.0pt; font-family: Calibri-Italic; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri-Italic;">CNR</span></em><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri;">) e os limiares de espessura de ouro foram determinados, seguindo as recomendações do protocolo europeu. </span><strong><span style="font-size: 8.0pt; font-family: ";Calibri-Bold";,";sans-serif";; mso-bidi-font-family: Calibri-Bold;">Resultados</span></strong><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri;">: O equipamento da Hologic LORAD M-IV apresentou maiores valores de </span><em><span style="font-size: 8.0pt; font-family: Calibri-Italic; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri-Italic;">CNR</span></em><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri;">, devido a melhor eficiência da grade, melhorando, consequentemente, a capacidade de detecção de detalhes menores que 0,1 mm, apresentando valores de limiar de espessura de ouro iguais ou menores que o recomendável. </span><strong><span style="font-size: 8.0pt; font-family: ";Calibri-Bold";,";sans-serif";; mso-bidi-font-family: Calibri-Bold;">Conclusão</span></strong><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri;">: A eficiência da grade antidifusora tem uma grande influencia na qualidade da imagem, pois reduz a radiação espalhada, aumenta o contraste e possibilita uma maior nitidez dos pequenos detalhes.</span></p> <!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves /> <w:TrackFormatting /> <w:HyphenationZone>21</w:HyphenationZone> <w:PunctuationKerning /> <w:ValidateAgainstSchemas /> 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