Desenvolvimento de um simulador radiográfico homogênio equivalente ao tórax canino para procedimentos de otimização de imagens radiográficas

• Autor(a) principal: Rosa, Maria Eugênia Dela [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155074; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-05-22/000874797.pdf
• topic: Exposição a radiação; Diagnóstico por imagem; Torax - Doenças - Diagnóstico; Cães - Doenças; Diagnostic imaging; Veterinária de pequenos animais

The use of digital radiographic imaging in veterinary practice are increasing. The use of radiation demands responsibility to maintain high image quality and as low as reasonable achievable doses. With the fast advances in radiography systems, techniques that have been traditionally considered optimum for analog systems may no longer be considered optimal for digital systems. Homogeneous phantoms are widely used in optimization procedures. These phantoms are made with polymethyl methacrylate (Lucite) and aluminum by classification and quantification of tissues from Computed Tomography (CT) exams. The aim of this study is to construct homogeneous canine chest phantoms for optimize X-rays exams. It was developed an automatic computational methodology to classify and quantify tissues (lung, adipose, muscular, and bones) in chest canine CT exams. The thickness of each tissue was converted in simulator materials (Lucite, aluminum and air). Dogs were separated in groups of 20 animals according to their weights (Small, Medium, Large and Giant). In the same canine group, it was noted variations due to the difference in nutritional statuses, breed and age. Furthermore, deviations in the mean air thickness resulted from changes in lung volume during inspiration and expiration. The statistical analysis by one-way ANOVA revealed a significant difference between canine groups for all simulator materials. As a result, four phantoms were constructed. In conclusion, the methodology presented herein allows develop phantoms of canine chest. The developed phantom is a practical tool, which will be employed in future works to optimize veterinary X-ray procedures